There are 100 balls in a box. 0.5 of them are yellow balls, and the rest are white and gold balls. If there are 37 as many white balls as gold balls. How many gold balls are there?
| Yellow balls |
White balls |
Gold balls |
Total |
| 1 u |
1 u |
2 u |
| |
3 p |
7 p |
|
0.5 =
510 =
12 Fraction of balls that are white and gold balls
= 1 -
12 =
12 Total number of balls = 2 u
2 u = 100
1 u = 100 ÷ 2 = 50
Number of white balls and gold balls
= 1 u
= 1 x 50
= 50
Number of white and gold balls
= 3 p + 7 p
= 10 p
10 p = 50
1 p = 50 ÷ 10 = 5
Number of gold balls
= 7 p
= 7 x 5
= 35
Answer(s): 35
