AlgebraHardLarge boxes in a delivery
Algebra practice question
A delivery contains 35 boxes weighing 90 kilograms in total. Each large box weighs 3 kilograms and each small box weighs 2 kilograms. How many large boxes are in the delivery?
Answer: 20
With l large boxes: 3l + 2(35 − l) = 90 gives l = 20.
Common wrong answers
- If you answered 15
- 15 is the number of small boxes.
- If you answered 30
- 30 divides 90 by 3, ignoring the small boxes.
- If you answered 17.5
- 17.5 splits the boxes evenly.
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