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Math Contest

Elementary Brain Teaser

Witch Books - February 05, 2007

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At a particular bookstore, the first Harry Potter book and the second Harry Potter book together cost $45 (excluding any taxes).  Two copies of the first Harry Potter book and 3 copies of the second Harry Potter book cost a total of $125.  At this bookstore, how much is one copy of the first Harry Potter book?

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Correct answers have been submitted by:

  1. Dan Liang. Garden Hills School, Champaign, IL USA
  2. Bilyana Tzolova. Mount Nittany Middle School, State College, PA USA
  3. Austin Lauffer. Highlands Elementary School, Santa Clarita, CA USA
  4. Carter Coriell. West Leesville Elementary School, Leesville, LA USA
  5. Shankar Balasubramanian. Herndon, VA USA
  6. Ruthann Weedon. Economy Elementary School, Baden, PA USA
  7. Liam Daily. Methow Valley Elementary School, Winthrop, WA USA
  8. Randi Morin. Stony Brook School, Hillsborough, NJ USA
  9. Dhruv Taneja. Liberty Elementary School, Columbus, OH USA
  10. William Burkhardt. Dimon School, Columbus, GA USA
  11. Lauren Biederman. Rutland Town Elementary School, Rutland, VT USA
  12. Ryan Roach. Highlands Elementary School, Santa Clarita, CA USA
  13. David Lu. P. School 139q, Rego Park, NY USA
  14. Joshua Yurtsever. Don Benito School, Los Angeles, CA USA
  15. David Chao. Hawks Rise Elementary School, Tallahassee, FL USA
  16. Langston Chen. School, Belmont, MA USA
  17. Morgan Labrie. Roosevelt Elementary School, Boise, ID USA
  18. Jessica Fan. MUES, Moorestown, NJ USA
  19. Hannah Bullock. Marengo Ranch School, Galt, CA USA
  20. Jenna Keith. Rutland Town School, Rutland, VT USA
  21. Everett Smith. Roosevelt Elementary School, Boise, ID USA
  22. Meredith Flury. Beacon Elementary School, Hilliard, OH USA
  23. Ben Shaffer. Mercer Elementary School, Mercer, PA USA
  24. Mason Dietrich. South Polk Elementary School, Fort Polk, LA USA
  25. Riley Bunch. Kingston Elementary School, Kingston, TN USA
  26. Jessica Fan. MUES, Moorestown, NJ USA
  27. Travis Redman. Rutland Town School, Rutland, VT USA
  28. Janson Ng. Singapore International School, Hong Kong, Hong Kong
  29. Cara Justine Teo Ong. The Beacon School, Imus, Philippines
  30. Stephen Chi Kong Ng. Singapore International School, Hong Kong, Hong Kong
  31. Albert Li. Marengo Elementary School, South Pasadena, CA USA
  32. Paul Banyi. Highlands Elementary School, Santa Clarita, CA USA
  33. Lynette Long. Remington Elementary School, Tulsa, OK USA
  34. Luke Rush. Remington Elementary School, Tulsa, OK USA
  35. Kirstin Carrico. Remington Elementary School, Tulsa, OK USA
  36. Christina Medwid. Riverview Public School, Dryden, Canada
  37. Colin Hicks. Remington Elementary School, Tulsa, OK USA
  38. Rebecca Kennedy. Riverview School, Dryden, Canada
  39. Tyler Stoiber. Riverview Public School, Dryden, Canada
  40. Samantha Smith. Riverview School, Dryden, Canada
  41. Cody Saunders. Riverview Public School, Dryden, Canada
  42. Glen Moody- Elias. Riverview School, Dryden, Canada
  43. Abby Bartlett. Riverview School, Dryden, Canada
  44. Kaitlyn Kahala. Remington Elementary School, Tulsa, OK USA
  45. Hannah Franzoni. Rutland Town School, Rutland Town, VT USA
  46. Sarah Hamilton. Rutland Town School, Rutland, VT USA
  47. Emily Andrulat. Rutland Town School, Rutland, VT USA
  48. Carly Rock. Mulberry Creek Elementary School, Cataula, GA USA
  49. Lisa & Sara Ogorzalek. Rutland Town School, Rutland, VT USA
  50. Matt Daminato. Johnson Elementary School, Franklin, TN USA
  51. Valerie Hanna. Roosevelt Elementary School, Boise, ID USA
  52. Sameeksha Malhotra. Garden Gate Elementary School, Cupertino, CA USA
  53. Michelle Aitken. Lowndes Academy, Hope Hull, AL USA
  54. Sudeshna Pontula. School, Bartlesville, OK USA
  55. Elizabeth Ann. Robert M. Martin Elementary School, Wichita, KS USA
  56. Loretta Peffers. South Polk Elementary School, Fort Polk, LA USA
  57. William Long. Remington Elementary School, Tulsa, OK USA
  58. Micah Cash. Remington Elementary School, Tulsa, OK USA
  59. Alax Wittttman. School, Saugus, CA USA
  60. Chris Stanbridge. Highlands Elementary School, Saugus, CA USA
  61. Irene Tang. Marengo Elementary School, South Pasadena, CA USA
  62. E Sung. Kinkaid School, Houston, TX USA
  63. Rebecca Barrios. Highlands Elementary School, Saugus, CA USA
  64. Cole Harmon. Harris County School, Fortson, GA USA
  65. Brenda Xu. Addison Elementary School, Palo Alto, CA USA
  66. Maresa Bowen. Rutland Town School, Rutland Town, VT USA
  67. Rebecca Shaffer. Mercer Elementary School, Mercer, PA USA
  68. Kevin Nelson. Emerald Heights School, Silverdale, WA USA
  69. Ioana Dobre. Rennies River Elementary School, St. Johns, Canada
  70. Jesse B.. Union Point Elementary School, Union Point, GA USA
  71. Kevin & Willie Dong. Mission Hill Middle School, Santa Cruz, CA USA
  72. Ms. Goldklangs Fourth Grade Class. Concord Road School, Ardsley, NY USA
  73. Zoeie Thomas. Brewer Elementary School, Columbus, GA USA
  74. Sanjana Nidugondi. Fairlands Elementary School, Pleasanton, CA USA
  75. Zachary Garlitos. Highlands Elementary School, Santa Clarita, CA USA
  76. Charles Dulac. Highlands Elementary School, Santa Clarita, CA USA
  77. Kevin Richardson. Highlands Elementary School, Santa Clarita, CA USA
  78. Jeremiah Cohen. Highlands Elementary School, Saugus, CA USA
  79. Courtney Kamyk. Rutland Town School, Rutland, VT USA
  80. Shelrita Newsome. Brewer Elementary School, Columbus, GA USA
  81. Tommy Downing. Oakdale Elementary School, Dedham, MA USA
  82. Dustin Van Kirk. Cherry Brook Primary School, Canton, CT USA
  83. Sheppard Math Club. Frederick Douglass Elementary School, Winchester, VA USA
  84. Jacob And Trent. Libety Elementary School, Worthington, OH USA
  85. Mrs. Longstreets Class. Brewer Elementary School, Columbus, GA USA
  86. Steve Hargis. Kingston School, Cherry Hill, NJ USA
  87. Ryan Carter. Highlands Elementary School, Saugus, CA USA
  88. Kara M.. Union Point Elementary School, Union Point, GA USA
  89. Miia Korpela. Naenae Intermediate School, Lower Hutt, New Zealand
  90. Madison Siebers. Canton Intermediate School, Canton, CT USA
  91. Sarah Ciesluk. St. James Catholic School, Duluth, MN USA
  92. Steven Hargis. Carusi Elementary School, Cherry Hill, NJ USA
  93. Keaton Pregozen. Highlands Elementary School, Santa Clarita, CA USA
  94. Steve Hargis. Kingston School, Cherry Hill, NJ USA
  95. Shelrita Newsome. Brewer Elementary School, Columbus, GA USA
  96. Key Elementary 5th Grade. School, Columbus, GA USA
  97. Mrs. Steinbergs Class. Concord Road School, Ardsley, NY USA
  98. Brittany Hutchins. Brewer Elementary School, Columbus, GA USA
  99. Sehajroop Singh. South Pasadena Middle School, South Pasadena, CA USA
  100. Akshay Sankar. International School Of Beijing, Beijing, China
  101. Christina Oanca. Cullman East Elementary School, Cullman, AL USA

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