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A box contains 90 bolts each of 100 gm and 100 bolts each of 150 gm. If the entire box weighs 35.5 kg., then the weight of the empty box is :

10 kg
10.5 kg
11 kg
11.5 kg
Explanation:
Let the weight of Empty box be x
90 × 0.100 + 100 × 0.150 + x = 35.5
Then x = 10.5 kg
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