PSLE Pupils in a school are put into two groups for an excursion.
47 of the pupils are in Group A and the rest in Group B.
1516 of the pupils in Group A are girls. In the school,
34 of the pupils are girls. What fraction of the pupils in Group B are girls?
Group A |
Group B |
Total |
4x4 |
3x4 |
7x4 |
|
|
4x7 |
16 u |
12 u |
28 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
15 |
1 |
|
|
3x7 |
1x7 |
15 u |
1 u |
6 u |
6 u |
21 u |
7 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 7 and 4 is 28.
Number of girls in Group B
= 21 u - 15 u
= 6 u
Fraction of the pupils in Group B that are girls
=
612=
12Answer(s):
12