It is 56
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The number that both 7 and 8 can go into evenly is 56.
Only the number 1
3*(n + 8) = 21 Divide both sides by 3: n + 8 = 21/3 = 7 Substract 8 from both sides: n = 7 - 8 = -1
The number 7 goes into both 56 and 119 (56/7 = 8, 56/7 = 17).
49 over 56 - all you need to do is take both the top number and the bottom number and multiply them by the same number - what you get will always be equal to 7 over 8 - for the example I gave before, i multiplied both numbers by 7