There are some pupils in the bird park.
14 of them are girls, of whom 60% of them do not wear watches.
23 of the boys do not wear watches. What is the percentage of the pupils in the bird park who wear watches?
| Girls |
Boys |
Total |
1x5 =
5 u |
3x5 =
15 u |
4x5 =
20 u |
| No watches |
Watches |
No watches |
Watches |
|
| 3x1 |
2x1 |
2x5 |
1x5 |
|
| 3 u |
2 u |
10 u |
5 u |
20 u |
60% =
60100=
35 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 5 is 5.
Number of pupils who wear watches
= 2 u + 5 u
= 7 u
Total number of pupils
= 3 u + 2 u + 10 u + 5 u
= 20 u
Percentage of the pupils in the bird park who wear watches
=
720 x 100%
= 35%
Answer(s): 35%
