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