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3500/42 give 83 quotient,14 remainder next possibility 42*84 =3528. 28 must be added to 3500 then only it will divisible by 42.now check the dividend 3528 with the following divisor 49,56,63

3528/49=72 divisible

3528/56=63 divisible

3528/63=56 divisible

So 3528 is divisible by 42,49,63,56

So 28 must be added 28 is the

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Q: What least number should be added to 3500 to make it exactly divisible by 42 49 56 and 63?
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