PSLE Students in a school are put into two groups for an excursion.
13 of the students are in Group A and the rest in Group B.
27 of the students in Group A are girls. In the school,
47 of the students are girls. What fraction of the students 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 |
2 |
5 |
|
|
4x3 |
3x3 |
2 u |
5 u |
10 u |
4 u |
12 u |
9 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
= 12 u - 2 u
= 10 u
Number of boys in Group B
= 14 u - 10 u
= 4 u
Fraction of the students in Group B that are boys
=
414=
27Answer(s):
27