PSLE Pupils in a school are put into two groups for an excursion.
511 of the pupils are in Group A and the rest in Group B.
910 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 |
5x2 |
6x2 |
11x2 |
|
|
2x11 |
10 u |
12 u |
22 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
9 |
1 |
|
|
1x11 |
1x11 |
9 u |
1 u |
2 u |
10 u |
11 u |
11 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 11 and 2 is 22.
Number of boys in Group B
= 11 u - 9 u
= 2 u
Number of girls in Group B
= 12 u - 2 u
= 10 u
Fraction of the pupils in Group B that are girls
=
1012=
56Answer(s):
56