PSLE Pupils in a school are put into two groups for an excursion.
49 of the pupils are in Group A and the rest in Group B.
78 of the pupils in Group A are boys. In the school,
12 of the pupils are boys. What fraction of the pupils in Group B are girls?
Group A |
Group B |
Total |
4x2 |
5x2 |
9x2 |
|
|
2x9 |
8 u |
10 u |
18 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
7 |
1 |
|
|
1x9 |
1x9 |
7 u |
1 u |
2 u |
8 u |
9 u |
9 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 9 and 2 is 18.
Number of boys in Group B
= 9 u - 7 u
= 2 u
Number of girls in Group B
= 10 u - 2 u
= 8 u
Fraction of the pupils in Group B that are girls
=
810=
45Answer(s):
45