Question

I have a math problem. I don't know were to start here's my problem. You have 3 cards in front of you, on one side there's a letter either R, V or B. On the other side there's a hidden number. Find the 3 number's. Here's the information we already know:
1) R+V=B
2) V+B= 180
3) 5xB=V
I need help!!!

Answer 1

The answer will be 21