There are 9 more teachers in School A than in School B. After 20% of the teachers left School A and 50% of teachers left School B, the number of teachers who remained in School A is four times that of the number of teachers in School B. Find the number of teachers in School A at first.
|
A |
B |
Before |
5 u |
2 u |
Change |
- 1 u |
- 1 u |
After |
4 u |
1 u |
20% =
20100 =
15 50% =
50100 =
12Number of more teachers in School A than in School B
= 5 u - 2 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Number of teachers in School A at first
= 5 u
= 5 x 3
= 15
Answer(s): 15