There are some pupils in the school hall.
310 of them are boys, of whom 20% of them do not wear scarves.
67 of the girls do not wear scarves. What is the percentage of the pupils in the school hall who wear scarves?
| Boys |
Girls |
Total |
3x5 =
15 u |
7x5 =
35 u |
10x5 =
50 u |
| No scarves |
Scarves |
No scarves |
Scarves |
|
| 1x3 |
4x3 |
6x5 |
1x5 |
|
| 3 u |
12 u |
30 u |
5 u |
50 u |
20% =
20100=
15 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 5 is 15.
Number of pupils who wear scarves
= 12 u + 5 u
= 17 u
Total number of pupils
= 3 u + 12 u + 30 u + 5 u
= 50 u
Percentage of the pupils in the school hall who wear scarves
=
1750 x 100%
= 34%
Answer(s): 34%
