PSLE Pupils in a school are put into two groups for an excursion.
14 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,
15 of the pupils are boys. What fraction of the pupils in Group B are boys?
Group A |
Group B |
Total |
1x5 |
3x5 |
4x5 |
|
|
5x4 |
5 u |
15 u |
20 u |
Boys |
Girls |
Boys |
Girls |
Boys |
Girls |
1 |
4 |
|
|
1x4 |
4x4 |
1 u |
4 u |
3 u |
12 u |
4 u |
16 u |
The total number of students is repeated.
Make the total number of students the same.
LCM of 4 and 5 is 20.
Number of boys in Group B
= 4 u - 1 u
= 3 u
Fraction of the pupils in Group B that are boys
=
315=
15Answer(s):
15