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.
37 of the pupils in Group A are girls. In the school,
37 of the pupils are girls. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
1x7 |
2x7 |
3x7 |
|
|
7x3 |
7 u |
14 u |
21 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
3 |
4 |
|
|
3x3 |
4x3 |
3 u |
4 u |
6 u |
8 u |
9 u |
12 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 3 and 7 is 21.
Number of girls in Group B
= 9 u - 3 u
= 6 u
Number of boys in Group B
= 14 u - 6 u
= 8 u
Fraction of the pupils in Group B that are boys
=
814=
47Answer(s):
47