math_celebrity Administrator Staff member Feb 10, 2017 #1 Rob has 40 coins, all dimes and quarters, worth $7.60. How many dimes and how many quarters does he have? We have two equations where d is the number of dimes and q is the number of quarters: d + q = 40 0.1d + 0.25q = 7.60 Using our simultaneous equation calculator, we get: d = 16 q = 24

Rob has 40 coins, all dimes and quarters, worth $7.60. How many dimes and how many quarters does he have? We have two equations where d is the number of dimes and q is the number of quarters: d + q = 40 0.1d + 0.25q = 7.60 Using our simultaneous equation calculator, we get: d = 16 q = 24