This is a simple question of fractions that is taught in third grade. You first divide 7 into 70 and then multiply the result by 3. It can be written '3/7 x 70'.
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the lowest common denominator is 70 the numerators would become 63 and 30
One-seventh = 21/7 = 3 so three-sevenths = 3 x 3 ie 9.
the answer is: 18six sevenths times twenty one wholes = 18
3
85.714%