PSLE Students in a school are put into two groups for an excursion.
23 of the students are in Group A and the rest in Group B.
1920 of the students in Group A are boys. In the school,
910 of the students are boys. What fraction of the students in Group B are girls?
Group A |
Group B |
Total |
2x10 |
1x10 |
3x10 |
|
|
10x3 |
20 u |
10 u |
30 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
19 |
1 |
|
|
9x3 |
1x3 |
19 u |
1 u |
8 u |
2 u |
27 u |
3 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 3 and 10 is 30.
Number of boys in Group B
= 27 u - 19 u
= 8 u
Number of girls in Group B
= 10 u - 8 u
= 2 u
Fraction of the students in Group B that are girls
=
210=
15Answer(s):
15