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Let D = the number of dimes Let N = the number of nickels 10D + 5N = 170 N = D + 10 10D + 5(D + 10) = 170 10D + 5D + 50 = 170 15D = 120 D = 120/15 D = 8 N = 18
35% off of 170= 35% discount applied to 170= 170 - (35% * 170)= 170 - (0.35 * 170)= 170 - 59.50= 110.50
30% of 170 = 30% * 170 = 0.3 * 170 = 51
12% of 170= 12% * 170= 0.12 * 170= 20.4
9% of 170= 9% * 170= 0.09 * 170= 15.3