Medical Entrance Exam (University of Iceland) · Quantitative Reasoning

Series and problem solving

76 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 76 questions

  1. What number comes next in the series 2, 4, 8, 16, 32, ...?
  2. What number comes next in the series 5, 22, 10, 17, 15, 12, ...?
  3. What number comes next in the series 10, 17, 26, 37, 50, ...?
  4. What number comes next in the series 1, 6, 7, 13, 20, 33, ...?
  5. Ana is 9 years old and her mother is 3 times as old as she is. How old will her mother be in 3 years?
  6. Rosa is taller than Luis, Luis is taller than Mateo, and Mateo is taller than Carla. Who is the shortest?
  7. One worker finishes a job in 15 days and another worker finishes it in 60 days. How long will they take if they work together?
  8. A school has 400 students and 10% of them take part in the music workshop. How many students take part?
  9. What number comes next in the series 11, 17, 23, 29, 35, ...?
  10. What number comes next in the series 3, 9, 27, 81, 243, ...?
  11. What number comes next in the series 3, 7, 13, 21, 31, ...?
  12. What number comes next in the series 3, 27, 7, 24, 11, 21, ...?
  13. What number comes next in the series 39, 52, 67, 84, 103, ...?
  14. What number comes next in the series 2, 6, 8, 14, 22, 36, ...?
  15. Ana is 8 years old and her mother is 4 times as old as she is. How old will her mother be in 3 years?
  16. Carla is taller than Luis, Luis is taller than Rosa, and Rosa is taller than Mateo. Who is the shortest?
  17. One worker finishes a job in 12 days and another worker finishes it in 20 days. How long will they take if they work together?
  18. A school has 400 students and 40% of them take part in the music workshop. How many students take part?
  19. What number comes next in the series 14, 21, 28, 35, 42, ...?
  20. What number comes next in the series 5, 10, 20, 40, 80, ...?
  21. What number comes next in the series 9, 20, 12, 15, 15, 10, ...?
  22. What number comes next in the series 11, 18, 27, 38, 51, ...?
  23. What number comes next in the series 5, 4, 9, 13, 22, 35, ...?
  24. Ana is 5 years old and her mother is 3 times as old as she is. How old will her mother be in 8 years?
  25. Carla is taller than Luis, Luis is taller than Mateo, and Mateo is taller than Rosa. Who is the shortest?
  26. One worker finishes a job in 15 days and another worker finishes it in 12 days. How long will they take if they work together?
  27. A school has 200 students and 40% of them take part in the music workshop. How many students take part?
  28. What number comes next in the series 19, 24, 29, 34, 39, ...?
  29. What number comes next in the series 2, 6, 18, 54, 162, ...?
  30. What number comes next in the series 1, 3, 8, 16, 27, ...?
  31. What number comes next in the series 9, 35, 11, 33, 13, 31, ...?
  32. What number comes next in the series 17, 26, 37, 50, 65, ...?
  33. What number comes next in the series 4, 2, 6, 8, 14, 22, ...?
  34. Ana is 7 years old and her mother is 3 times as old as she is. How old will her mother be in 3 years?
  35. Luis is taller than Carla, Carla is taller than Rosa, and Rosa is taller than Mateo. Who is the shortest?
  36. A school has 80 students and 20% of them take part in the music workshop. How many students take part?
  37. What number comes next in the series 11, 14, 17, 20, 23, ...?
  38. What number comes next in the series 5, 15, 45, 135, 405, ...?
  39. What number comes next in the series 4, 6, 11, 19, 30, ...?
  40. What number comes next in the series 7, 40, 11, 36, 15, 32, ...?
  41. What number comes next in the series 6, 11, 18, 27, 38, ...?
  42. What number comes next in the series 3, 6, 9, 15, 24, 39, ...?
  43. Ana is 5 years old and her mother is 2 times as old as she is. How old will her mother be in 7 years?
  44. Mateo is taller than Luis, Luis is taller than Rosa, and Rosa is taller than Carla. Who is the shortest?
  45. One worker finishes a job in 10 days and another worker finishes it in 30 days. How long will they take if they work together?
  46. What number comes next in the series 10, 17, 24, 31, 38, ...?
  47. What number comes next in the series 3, 6, 12, 24, 48, ...?
  48. What number comes next in the series 9, 39, 12, 36, 15, 33, ...?
  49. What number comes next in the series 4, 9, 16, 25, 36, ...?
  50. What number comes next in the series 5, 6, 11, 17, 28, 45, ...?
  51. Ana is 8 years old and her mother is 4 times as old as she is. How old will her mother be in 8 years?
  52. Mateo is taller than Rosa, Rosa is taller than Luis, and Luis is taller than Carla. Who is the shortest?
  53. A school has 120 students and 25% of them take part in the music workshop. How many students take part?
  54. What number comes next in the series 3, 7, 11, 15, 19, ...?
  55. What number comes next in the series 4, 8, 16, 32, 64, ...?
  56. What number comes next in the series 7, 36, 11, 31, 15, 26, ...?
  57. What number comes next in the series 12, 19, 28, 39, 52, ...?
  58. Ana is 10 years old and her mother is 4 times as old as she is. How old will her mother be in 8 years?
  59. One worker finishes a job in 12 days and another worker finishes it in 30 days. How long will they take if they work together?
  60. A school has 250 students and 10% of them take part in the music workshop. How many students take part?
  61. What number comes next in the series 4, 12, 20, 28, 36, ...?
  62. What number comes next in the series 1, 2, 4, 8, 16, ...?
  63. What number comes next in the series 7, 11, 18, 28, 41, ...?
  64. What number comes next in the series 10, 37, 13, 31, 16, 25, ...?
  65. What number comes next in the series 25, 36, 49, 64, 81, ...?
  66. Ana is 12 years old and her mother is 4 times as old as she is. How old will her mother be in 4 years?
  67. Carla is taller than Rosa, Rosa is taller than Mateo, and Mateo is taller than Luis. Who is the shortest?
  68. One worker finishes a job in 6 days and another worker finishes it in 15 days. How long will they take if they work together?
  69. A school has 200 students and 30% of them take part in the music workshop. How many students take part?
  70. What number comes next in the series 4, 7, 10, 13, 16, ...?
  71. What number comes next in the series 1, 5, 6, 11, 17, 28, ...?
  72. Mateo is taller than Rosa, Rosa is taller than Carla, and Carla is taller than Luis. Who is the shortest?
  73. One worker finishes a job in 10 days and another worker finishes it in 15 days. How long will they take if they work together?
  74. A school has 250 students and 40% of them take part in the music workshop. How many students take part?
  75. What number comes next in the series 6, 8, 13, 21, 32, ...?
  76. What number comes next in the series 5, 5, 10, 15, 25, 40, ...?

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