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25% = a quarter.

A quarter of 1600 = 400 and a quarter of 4 = 1

so a quarter of 1600 - 4 = 400 - 1

that is, a quarter of 1596 = 399.

The actual number, 1595, is one less so a quarter of that is a quarter less. Thus the exact answer, with only a little effort, is found to be 399-0.25 = 398.75

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12y ago

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