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Suppose Mary has X quarters, then she has X + 11 nickels. Total nickels and quarters should add upto 2.65. So (X+11)*0.05 + X*0.25 = 2.65 => 0.30X = 2.65 - 0.55 => X = 7 (Number of Quarters) Number of Nickels = 7+11 = 18
Total coins = 18+7 = 25
I do not see this option in Answer. May be question asked for number of nickels Mary has, so in that case answer is 18.