-5
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The number you are looking for is 12. Reversing the digits gives you 21 75% of 12 is 9 12 + 9 = 21
3(x+21) = 2(x+23)3x+63=2x+46x=-17
let X = number X + 1/2 X = 21 1.5 X = 21 X = 14
To calculate half (1/2) of any number, divide that number by 2.
It is 16. This is because there are five numbers between 11 and 16, and there are five numbers between 16 and 21 :]