The weight of 15 boxes with plums is 105 kg and 14 boxes with grapes -42 kg.

The weight of 15 boxes with plums is 105 kg and 14 boxes with grapes -42 kg. How many kilograms is the weight of a box with grapes less than the weight of a box with plums?

1. Let’s find what the mass of one box with plums is equal to, for this we divide the mass of 15 boxes by 15:
105/15 = 7 kg.
2. Let’s find what the mass of one box with grapes is equal to, for this we divide the mass of 14 boxes with grapes by 14:
42/14 = 3 kg.
3. Let’s find the difference in the weight of one box with plums and a box with grapes:
7 – 3 = 4 kg.
Answer: the weight of the box with grapes is 4 kg less than the box with plums.