PSLE Students in a school are put into two groups for an excursion.
310 of the students are in Group A and the rest in Group B.
49 of the students in Group A are girls. In the school,
13 of the students are girls. What fraction of the students in Group B are boys?
Group A |
Group B |
Total |
3x3 |
7x3 |
10x3 |
|
|
3x10 |
9 u |
21 u |
30 u |
Girls |
Boys |
Girls |
Boys |
Girls |
Boys |
4 |
5 |
|
|
1x10 |
2x10 |
4 u |
5 u |
6 u |
15 u |
10 u |
20 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 10 and 3 is 30.
Number of girls in Group B
= 10 u - 4 u
= 6 u
Number of boys in Group B
= 21 u - 6 u
= 15 u
Fraction of the students in Group B that are boys
=
1521=
57Answer(s):
57