There are some pupils in the fun fair.
310 of them are boys, of whom 50% of them do not wear watches.
67 of the girls do not wear watches. What is the percentage of the pupils in the fun fair who wear watches?
| Boys |
Girls |
Total |
3x2 =
6 u |
7x2 =
14 u |
10x2 =
20 u |
| No watches |
Watches |
No watches |
Watches |
|
| 1x3 |
1x3 |
6x2 |
1x2 |
|
| 3 u |
3 u |
12 u |
2 u |
20 u |
50% =
50100=
12 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 2 is 6.
Number of pupils who wear watches
= 3 u + 2 u
= 5 u
Total number of pupils
= 3 u + 3 u + 12 u + 2 u
= 20 u
Percentage of the pupils in the fun fair who wear watches
=
520 x 100%
= 25%
Answer(s): 25%
