There are some pupils in the stadium.
15 of them are girls, of whom 50% of them do not wear watches.
14 of the boys do not wear watches. What is the percentage of the pupils in the stadium who do not wear watches?
| Girls |
Boys |
Total |
1x2 =
2 u |
4x2 =
8 u |
5x2 =
10 u |
| No watches |
Watches |
No watches |
Watches |
|
| 1x1 |
1x1 |
1x2 |
3x2 |
|
| 1 u |
1 u |
2 u |
6 u |
10 u |
50% =
50100=
12 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 2 is 2.
Number of pupils who do not wear watches
= 1 u + 2 u
= 3 u
Total number of pupils
= 1 u + 1 u + 2 u + 6 u
= 10 u
Percentage of the pupils in the stadium who do not wear watches
=
310 x 100%
= 30%
Answer(s): 30%
