There are 198 balls in a basket. 0.5 of them are grey balls, and the rest are brown and blue balls. If there are 38 as many brown balls as blue balls. How many blue balls are there?
| Grey balls |
Brown balls |
Blue balls |
Total |
| 1 u |
1 u |
2 u |
| |
3 p |
8 p |
|
0.5 =
510 =
12 Fraction of balls that are brown and blue balls
= 1 -
12 =
12 Total number of balls = 2 u
2 u = 198
1 u = 198 ÷ 2 = 99
Number of brown balls and blue balls
= 1 u
= 1 x 99
= 99
Number of brown and blue balls
= 3 p + 8 p
= 11 p
11 p = 99
1 p = 99 ÷ 11 = 9
Number of blue balls
= 8 p
= 8 x 9
= 72
Answer(s): 72
