PSLE Pupils in a school are put into two groups for an excursion.
15 of the pupils are in Group A and the rest in Group B.
13 of the pupils in Group A are boys. In the school,
13 of the pupils are boys. What fraction of the pupils in Group B are girls?
Group A |
Group B |
Total |
1x3 |
4x3 |
5x3 |
|
|
3x5 |
3 u |
12 u |
15 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
1 |
2 |
|
|
1x5 |
2x5 |
1 u |
2 u |
4 u |
8 u |
5 u |
10 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 5 and 3 is 15.
Number of boys in Group B
= 5 u - 1 u
= 4 u
Number of girls in Group B
= 12 u - 4 u
= 8 u
Fraction of the pupils in Group B that are girls
=
812=
23Answer(s):
23