Question

A box contains orange balls and green balls. The number of green balls is seven more than 2 times the number of orange balls. If there are 73 balls altogether, then how many green balls and orange balls are there in the box?

Answer 1

52-green

15-orange

Explanation:

g + o = 67

g = green, o = orange, x = total = 3o + 7

use substitution: (3o + 7) + o = 67

solve for o:4o + 7 = 67

4o = 60o

= 60/4 = 15

solve for g:

g + 15 = 67

g = 52