PSLE Pupils in a school are put into two groups for an excursion.
12 of the pupils are in Group A and the rest in Group B.
19 of the pupils in Group A are boys. In the school,
29 of the pupils are boys. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
1x9 |
1x9 |
2x9 |
|
|
9x2 |
9 u |
9 u |
18 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
1 |
8 |
|
|
2x2 |
7x2 |
1 u |
8 u |
3 u |
6 u |
4 u |
14 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 2 and 9 is 18.
Number of boys in Group B
= 4 u - 1 u
= 3 u
Fraction of the pupils in Group B that are boys
=
39=
13Answer(s):
13