Problem 9 · Find the missing change · 3 points
Made by AI and not reviewed by a real person.
A frog has jump cards marked 1, 2, 3, 4, and 5; each card tells how far to jump, and it uses each card once. Starting on 6, it lands on 10, 11, 16, and 18—where will it land after its last jump?
- 22
- 24
- 20
- 19
- 21
Show a hint
- The landings don't show the card numbers directly. Think about what happened between each pair of landings.
- Find the lengths of the four jumps so far, then see which card is left.
Show the answer and solution
Answer: E — 21
The four jumps are 4, 1, 5, and 2, leaving the 3-step card. The frog lands on 18 + 3 = 21. The jumps 4, 1, 5, 2 might tempt you to choose 24 by jumping 6 next, but there is no 6-step card.