John has 11 more quarters than dimes. He has a total of $7.65. How many quarters and dimes does he have?
Math - Mac, Friday, December 7, 2012 at 9:44pm
Q = 11 + D
25Q + 10D = 765
Math - PsyDAG, Saturday, December 8, 2012 at 12:14pm
Substitute 11+D for Q in second equation and solve for D. Insert that value into the first equation and solve for Q. Check by inserting both values into the second equation.