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If mass of a  crayon is u kg, the mass of a empty box is 3.7 – 100u.

Now 

3.7 – 100u = 2.5 – 60u

40u = 1.2

u = 0.03

3.7 – 100 ( 0.03) = 0.7

So the weight of the empty box is 0.7 kg.

 

 

Check: 2.5 – 60 ( 0.03) = 2.5 – 1.8 = 0.7 Checked.

0 Replies 2 Likes ✔Accepted Answer