Based on the value of the coins, one can write this equation:

10d + 25q = 1310  (1)   (in cents)



Another equation can be written based on the information given that relates number of quarters to number of dimes:

q = 15 + 3d       (2)



One way to solve is to substitute 'q' in (1) the RHS of (2), then solve for the single unknown 'd'.  Finally, use (plug in) that value of 'd' into (2)  (or (1), but (2) looks easier) and solve for q.   Don't forget to check your answer.











 

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