4. If the difference between a number and one seventh of its is 42.
Find the number
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Answer:
Let the number be x
By the problem,
= x-(1/7 × x)=42
= x-1/7x=42
=7x-x/7=42
= 6x/7=42
= x=42×7/6
= x=7×7
= x=49
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