There are 30 more teachers in School N than in School P. After 20% of the teachers left School N and 50% of teachers left School P, the number of teachers who remained in School N is four times that of the number of teachers in School P. Find the number of teachers in School N at first.
|
N |
P |
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 N than in School P
= 5 u - 2 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Number of teachers in School N at first
= 5 u
= 5 x 10
= 50
Answer(s): 50