PSLE Pupils in a school are put into two groups for an excursion.
18 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 |
7x3 |
8x3 |
|
|
3x8 |
3 u |
21 u |
24 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
1 |
2 |
|
|
1x8 |
2x8 |
1 u |
2 u |
7 u |
14 u |
8 u |
16 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 8 and 3 is 24.
Number of boys in Group B
= 8 u - 1 u
= 7 u
Number of girls in Group B
= 21 u - 7 u
= 14 u
Fraction of the pupils in Group B that are girls
=
1421=
23Answer(s):
23