# Math

posted by
**Angie**
.

How do you find the answer for this:

Pam is playing with red and black marbles. The number of red marbles she has is three more than twice the number of black marbles she has. She has 42 marbles in all. How many red marbles does Pam have?

a. 13

b. 15

c. 29

d. 33