There are 120 balls in Tina's collection. The number of her gold balls is 2 times the number of her grey balls.
- How many grey balls does she have?
- How many gold balls does she have?
(a)
Number of grey balls = 1 u
Number of gold balls = 2 u
Total number of balls
= 1 u + 2 u
= 3 u
3 u = 120
1 u = 120 ÷ 3 = 40
Number of grey balls
= 1 u
= 40
(b)
Number of gold balls
= 2 u
= 2 x 40
= 80
Answer(s): (a) 40; (b) 80