There are 144 balls in a bag. 0.5 of them are red balls, and the rest are silver and yellow balls. If there are 15 as many silver balls as yellow balls. How many yellow balls are there?
| Red balls |
Silver balls |
Yellow balls |
Total |
| 1 u |
1 u |
2 u |
| |
1 p |
5 p |
|
0.5 =
510 =
12 Fraction of balls that are silver and yellow balls
= 1 -
12 =
12 Total number of balls = 2 u
2 u = 144
1 u = 144 ÷ 2 = 72
Number of silver balls and yellow balls
= 1 u
= 1 x 72
= 72
Number of silver and yellow balls
= 1 p + 5 p
= 6 p
6 p = 72
1 p = 72 ÷ 6 = 12
Number of yellow balls
= 5 p
= 5 x 12
= 60
Answer(s): 60
