PSLE Pupils in a school are put into two groups for an excursion.
16 of the pupils are in Group A and the rest in Group B.
15 of the pupils in Group A are boys. In the school,
710 of the pupils are boys. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
1x5 |
5x5 |
6x5 |
|
|
10x3 |
5 u |
25 u |
30 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
1 |
4 |
|
|
7x3 |
3x3 |
1 u |
4 u |
20 u |
5 u |
21 u |
9 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 6 and 10 is 30.
Number of boys in Group B
= 21 u - 1 u
= 20 u
Fraction of the pupils in Group B that are boys
=
2025=
45Answer(s):
45