PSLE Pupils in a school are put into two groups for an excursion.
47 of the pupils are in Group A and the rest in Group B.
1112 of the pupils in Group A are boys. In the school,
23 of the pupils are boys. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
4x3 |
3x3 |
7x3 |
|
|
3x7 |
12 u |
9 u |
21 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
11 |
1 |
|
|
2x7 |
1x7 |
11 u |
1 u |
3 u |
6 u |
14 u |
7 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 7 and 3 is 21.
Number of boys in Group B
= 14 u - 11 u
= 3 u
Fraction of the pupils in Group B that are boys
=
39=
13Answer(s):
13