If 15% of a number is 9 note that 5% of that number is 3:
0.15x=9
0.15x/3=9/3
0.05x=3
5% of something is 1/20 of something so multiply both sides by 20
and you get the number is 60.
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n X .15 = 9 9 / .15 = n 9 / .15 = 60
It is 5/3 times 9 equals 15
77777.77778 x 9% = 7000
1.5% of 15 is 9/40 or 0.225
15 - n when n equals 9 = 6