PSLEFabian had 8 bags of balls. At first, each of the bags contained the same number of balls. He took 15 balls from each bag. After that, the total number of balls left in the 8 bags was equal to the total number of balls in 2 of the bags at first. What was the number of balls in each bag at first?
|
2 bags at first |
Total bags in the end |
Number |
2 |
8 |
Value |
1 u + 15 |
1 u |
Total value |
2 u + 30 |
8 u |
Number of balls in each bag in the end = 1 u
Number of balls in each bag at first = 1 u + 15
Number of balls in 2 bags at first
= 2 x (1 u + 15)
= 2 u + 30
Total number of balls left in the 8 bags was equal to total number of balls in 2 bags at first.
8 u = 2 u + 30
8 u - 2 u = 30
6 u = 30
1 u = 30 ÷ 6 = 5
Number of balls in each bag at first
= 1 u + 15
= 5 + 15
= 20
Answer(s): 20