a) 51.5 kg
b) 75 kg
c) 37.5 kg
d) 112.5 kg
Answer: b
Explanation: The weight of boxes is :
1st box = 200 kg
2nd box = 300 kg
3rd box = 250 kg
4th box = 350 kg
5th box = 500 kg
difference between heavier 4 and lighter 4 is 300
difference in average is 75
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