A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 4 days. How long B alone would take to do the whole work?
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If 4 x 9 x 3 = 4 and 5 x 3 x 1 = 3, then9 x 9 x 7 = ?
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CAD stands for _____.
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