Bob has 60 coins consisting of quarters and dimes. The coins combined value is $13.35. How many quarters and how many dimes does he have?

D + Q = 60

.10d + .25q = 13.35

.10(60+Q) + .25q= 13.35

6 + .15q = 13.35

.15q = 7.35

Q = 49

D + 49 = 60

D = 11

Bob has 49 quarters and 11 dimes.

Step-by-step explanation:

The process of substitution was used to solve this problem.

describing distributions is one of the key skills you’ll need to earn a high score on the ap statistics exam. if you need proof of this, just flip through some past exam questions, which can be found at the collegeboard website. you’ll notice that the first free response question is almost always a question requiring you to look at a graph and describe it.

step-by-step explanation: just trying to get points sorry : (