PSLE Pupils in a school are put into two groups for an excursion.
14 of the pupils are in Group A and the rest in Group B.
45 of the pupils in Group A are boys. In the school,
710 of the pupils are boys. What fraction of the pupils in Group B are girls?
Group A |
Group B |
Total |
1x5 |
3x5 |
4x5 |
|
|
10x2 |
5 u |
15 u |
20 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
4 |
1 |
|
|
7x2 |
3x2 |
4 u |
1 u |
10 u |
5 u |
14 u |
6 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 4 and 10 is 20.
Number of boys in Group B
= 14 u - 4 u
= 10 u
Number of girls in Group B
= 15 u - 10 u
= 5 u
Fraction of the pupils in Group B that are girls
=
515=
13Answer(s):
13