PSLE Pupils in a school are put into two groups for an excursion.
13 of the pupils are in Group A and the rest in Group B.
25 of the pupils in Group A are girls. In the school,
25 of the pupils are girls. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
1x5 |
2x5 |
3x5 |
|
|
5x3 |
5 u |
10 u |
15 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
2 |
3 |
|
|
2x3 |
3x3 |
2 u |
3 u |
4 u |
6 u |
6 u |
9 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 3 and 5 is 15.
Number of girls in Group B
= 6 u - 2 u
= 4 u
Number of boys in Group B
= 10 u - 4 u
= 6 u
Fraction of the pupils in Group B that are boys
=
610=
35Answer(s):
35