PSLE Pupils in a school are put into two groups for an excursion.
811 of the pupils are in Group A and the rest in Group B.
916 of the pupils in Group A are girls. In the school,
12 of the pupils are girls. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
8x2 |
3x2 |
11x2 |
|
|
2x11 |
16 u |
6 u |
22 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
9 |
7 |
|
|
1x11 |
1x11 |
9 u |
7 u |
2 u |
4 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 girls in Group B
= 11 u - 9 u
= 2 u
Number of boys in Group B
= 6 u - 2 u
= 4 u
Fraction of the pupils in Group B that are boys
=
46=
23Answer(s):
23