PSLE Pupils in a school are put into two groups for an excursion.
23 of the pupils are in Group A and the rest in Group B.
18 of the pupils in Group A are girls. In the school,
14 of the pupils are girls. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
2x4 |
1x4 |
3x4 |
|
|
4x3 |
8 u |
4 u |
12 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
1 |
7 |
|
|
1x3 |
3x3 |
1 u |
7 u |
2 u |
2 u |
3 u |
9 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 3 and 4 is 12.
Number of girls in Group B
= 3 u - 1 u
= 2 u
Number of boys in Group B
= 4 u - 2 u
= 2 u
Fraction of the pupils in Group B that are boys
=
24=
12Answer(s):
12