x + 12.
If the unknown number is represented by x, the expression for a number increased by 12 would be x + 12.
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If 8 is increased to 12, the increase is what percentage of the original number?
39
4
The number you are looking for is 12. Reversing the digits gives you 21 75% of 12 is 9 12 + 9 = 21
6(n+12) + 3(n+6) = 58.5 6n + 72 + 3n + 18 = 58.5 9n + 90 = 58.5 9n = 58.5 - 90 9n = -31.5 n = -3.5