Homework Help: Math

Posted by Angie on Monday, May 25, 2009 at 11:46am.

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

Math - DrBob222, Monday, May 25, 2009 at 12:16pm
Let R = # red marbles
and B = # black marbles.
===========================
R + B = 42
R = 3B + 3
Solve the two equations.
I have 13 for B and 29 for R but check me out. Check my work. Check my thinking.
Math - Angie, Monday, May 25, 2009 at 12:53pm
thanks

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