There are 180 balls in a box. 0.5 of them are blue balls, and the rest are grey and pink balls. If there are 37 as many grey balls as pink balls. How many pink balls are there?
| Blue balls |
Grey balls |
Pink balls |
Total |
| 1 u |
1 u |
2 u |
| |
3 p |
7 p |
|
0.5 =
510 =
12 Fraction of balls that are grey and pink balls
= 1 -
12 =
12 Total number of balls = 2 u
2 u = 180
1 u = 180 ÷ 2 = 90
Number of grey balls and pink balls
= 1 u
= 1 x 90
= 90
Number of grey and pink balls
= 3 p + 7 p
= 10 p
10 p = 90
1 p = 90 ÷ 10 = 9
Number of pink balls
= 7 p
= 7 x 9
= 63
Answer(s): 63
