There was an equal number of grey and white balls in a bag at first. After 24 white balls were taken out and 50 grey balls were added into the bag, there was
13 as many white balls as grey balls. Find the number of white balls in the bag at first.
| |
Grey balls |
White balls |
| Before |
3 u - 50 |
1 u + 24 |
| Change |
+ 50 |
- 24 |
| After |
3 u |
1 u |
The number of grey and white balls in the bag is the same at first.
3 u - 50 = 1 u + 24
3 u - 1 u = 24 + 50
2 u = 74
1 u = 74 ÷ 2 = 37
Number of white balls at first
= 1 u + 24
= 37 + 24
= 61
Answer(s)61
