# SOLUTION: John has a total of 13 coins in his pocket. Of the 13 coins, they are all either quarters or dimes. The total value of the coins is \$2.50. How many quarters does John have in his p

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Coins -> SOLUTION: John has a total of 13 coins in his pocket. Of the 13 coins, they are all either quarters or dimes. The total value of the coins is \$2.50. How many quarters does John have in his p      Log On

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 Click here to see ALL problems on Word Problems With Coins Question 248649: John has a total of 13 coins in his pocket. Of the 13 coins, they are all either quarters or dimes. The total value of the coins is \$2.50. How many quarters does John have in his pocket?Answer by stanbon(57316)   (Show Source): You can put this solution on YOUR website!John has a total of 13 coins in his pocket. Of the 13 coins, they are all either quarters or dimes. The total value of the coins is \$2.50. How many quarters does John have in his pocket? ---------------------- Equations: Quantity Equation: q + d = 13 Value Equation::::25q+10d = 250 ------------------------------------ Multiply thru the 1st equation by 10. 10q + 10d = 130 25q + 10d = 250 --------------------- Subtract the 1st equation from the 2nd and solve for "q": 15q = 120 q = 8 (# of quarters) --------------------------- Cheers, Stan H.