2/7 of 63 means 2/7 x 63. Multiply 2 x 63, then divide the result by 7. You may also divide 63 / 7 first, then multiply by 2 - in this case it is simpler, because it is divisible, and results in smaller numbers for the intermediate calculations.
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63 × 2/7 = 18
They are: 3/7 and 2/9 are the equivalent 27/63 and 14/63
lcm(7, 9) = 63 → equivalent fractions are: 3/7 = (3×9)/(7×9) = 27/63 2/9 = (2×7)/(9×7) = 14/63
h/9=7 multiply both sides by 9 h=63
2/7 * 5/9 = (2*5)/(7*9) = 10/63