PSLE Pupils in a school are put into two groups for an excursion.
27 of the pupils are in Group A and the rest in Group B.
38 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 |
2x4 |
5x4 |
7x4 |
|
|
4x7 |
8 u |
20 u |
28 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
3 |
5 |
|
|
3x7 |
1x7 |
3 u |
5 u |
18 u |
2 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 - 3 u
= 18 u
Fraction of the pupils in Group B that are girls
=
1820=
910Answer(s):
910