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