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Thanks.

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Since this thread was all related you should...

15 and 7 belong together, it's a ratio with either days/men or men/days depending on how arranged.

So 15 men / 7 days or 7 days / 15 men.

Your also given 21 men and you need to have units of...

1. is correct but you should pay more attention to the units.

Use cost/book * number of books

thus $126 cost /63 books * 125 books

You get the same answer and the units are $

2. Same deal...