There are some pupils in the stadium.
25 of them are girls, of whom 20% of them do not wear hats.
13 of the boys do not wear hats. What is the percentage of the pupils in the stadium who wear hats?
| Girls |
Boys |
Total |
2x5 =
10 u |
3x5 =
15 u |
5x5 =
25 u |
| No hats |
Hats |
No hats |
Hats |
|
| 1x2 |
4x2 |
1x5 |
2x5 |
|
| 2 u |
8 u |
5 u |
10 u |
25 u |
20% =
20100=
15 The number of girls is the repeated identity. Make the number of girls the same. LCM of 2 and 5 is 10.
Number of pupils who wear hats
= 8 u + 10 u
= 18 u
Total number of pupils
= 2 u + 8 u + 5 u + 10 u
= 25 u
Percentage of the pupils in the stadium who wear hats
=
1825 x 100%
= 72%
Answer(s): 72%
