The solution will depend entirely on the question which has not been given.
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3 x 5 = 15
16
2y = 15 y = 15/2 y = 7.5
15% of 80 = 80*15/100 = 12
Let x represent the unknown nimber. Set up the equation and solve (15% is the same as .15) .15 * x = 18 (next divide both sides by .15 to solve for x) x = 120 15% of 120 = 18