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Can u please only answer b . i know the answer to a.

Can u please only answer b . i know the answer to a.-example-1
User Webchun
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The weight of b boxes would be 60b.

In fact, a certain number of boxes will weight


\underbrace{60+60+60+\ldots+60}_{\text{number of boxes}}

This repeated sum of the same number is exactly what multiplication means and so if you sum 60 with itself b times, you'll end up with
60* b

User AdrienXL
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