In a school field,
13 of the pupils wore vests. After 35 pupils who wore vests entered the school field, the percentage of pupils who wore vests increased to 75%. How many pupils in the school field did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
1x1 =
1 u |
2x1 =
2 u |
| Change |
+ 35 |
|
| After |
3x2 =
6 u |
1x2 =
2 u |
75% =
75100 =
34The number of pupils who did not wear vests remains unchanged. LCM of 2 and 1 is 2.
Number of pupils who wore vests and left
= 6 u - 1 u
= 5 u
5 u = 35
1 u = 35 ÷ 5 = 7
Number of pupils who did not wear vests
= 2 u
= 2 x 7
= 14
Answer(s): 14
