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Question

If 35 workers can build a house in 16 days, then it takes days for 28 workers working at the same rate to build the same house.

A
20
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B
28
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C
30
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Solution

The correct option is A 20
Let 28 workers can build a house in x days.

According to the question

35 workers can build a house in 16 days
Then 28 workers can build a house in x days

Hence

By the principle of inverse proportion, we have
35×16=28×x

x=35×1628
x = 20

Therefore, 28 workers can build a house in 20 days

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