There are 156 balls in Yoko's collection. The number of her black balls is 2 times the number of her grey balls.
- How many grey balls does she have?
- How many black balls does she have?
(a)
Number of grey balls = 1 u
Number of black balls = 2 u
Total number of balls
= 1 u + 2 u
= 3 u
3 u = 156
1 u = 156 ÷ 3 = 52
Number of grey balls
= 1 u
= 52
(b)
Number of black balls
= 2 u
= 2 x 52
= 104
Answer(s): (a) 52; (b) 104