Shaun collects coins. He has 15 quarters and 20 pennies in a jar. What is the ratio of quarters to pennies in the jar?

A.
15:1
B.
1:15
C.
4:3
D.
3:4

The ratio of quarters to pennies in the jar is 15:20.

To simplify the ratio, we can divide both numbers by their greatest common divisor, which is 5.

15 divided by 5 is 3.
20 divided by 5 is 4.

Therefore, the simplified ratio is 3:4.

The correct answer is D. 3:4.