There are 144 balls in a bag. 0.5 of them are black balls, and the rest are gold and white balls. If there are 17 as many gold balls as white balls. How many white balls are there?
| Black balls |
Gold balls |
White balls |
Total |
| 1 u |
1 u |
2 u |
| |
1 p |
7 p |
|
0.5 =
510 =
12 Fraction of balls that are gold and white balls
= 1 -
12 =
12 Total number of balls = 2 u
2 u = 144
1 u = 144 ÷ 2 = 72
Number of gold balls and white balls
= 1 u
= 1 x 72
= 72
Number of gold and white balls
= 1 p + 7 p
= 8 p
8 p = 72
1 p = 72 ÷ 8 = 9
Number of white balls
= 7 p
= 7 x 9
= 63
Answer(s): 63
