PSLE Pupils in a school are put into two groups for an excursion.
16 of the pupils are in Group A and the rest in Group B.
23 of the pupils in Group A are girls. In the school,
79 of the pupils are girls. What fraction of the pupils in Group B are girls?
Group A |
Group B |
Total |
1x3 |
5x3 |
6x3 |
|
|
9x2 |
3 u |
15 u |
18 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
2 |
1 |
|
|
7x2 |
2x2 |
2 u |
1 u |
12 u |
3 u |
14 u |
4 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 6 and 9 is 18.
Number of girls in Group B
= 14 u - 2 u
= 12 u
Fraction of the pupils in Group B that are girls
=
1215=
45Answer(s):
45