There are 27 more teachers in School C than in School D. After 20% of the teachers left School C and 50% of teachers left School D, the number of teachers who remained in School C is four times that of the number of teachers in School D. Find the number of teachers in School C at first.
|
C |
D |
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 C than in School D
= 5 u - 2 u
= 3 u
3 u = 27
1 u = 27 ÷ 3 = 9
Number of teachers in School C at first
= 5 u
= 5 x 9
= 45
Answer(s): 45