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..."some number" x 16% = 18 OR
n x 0.16 = 18
If you don't know how to set the problem up, turn it into a simple problem you DO know how to set up.
a x b = c is the same problem as
3 x 4 = 12 is the same problem as
n x 0.16 = 18
In our problem, we KNOW the value of c (it's 18) and we know the value of b (it's 0.16). To get a (the one we DON'T know, we divide c by b).
So, 18/0.16 = n
112.5 = n
To double-check, insert 112.5 into the original problem and see if it works.
112.5 x 0.16 DOES equal 18, so we know the answer is correct.
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