AlgebraEasyNumber of boxes in a stack
Algebra practice question
A stack consists of a 15-centimetre base with a number of identical boxes, each 24 centimetres tall, on top of it. The stack is 135 centimetres tall. How many boxes are in the stack?
Answer: 5
15 + 24n = 135 → 24n = 120 → n = 5.
Common wrong answers
- If you answered 120
- 120 is the height of the boxes alone, in centimetres.
- If you answered 5.625
- 5.625 is 135 ÷ 24, ignoring the base.
- If you answered 6.25
- 6.25 comes from (135 + 15) ÷ 24.
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