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