24 Primary 4 students and 20 of Primary 5 students went on a school camp. The number of Primary 5 girls was 5 times the number of Primary 4 girls, and there were 16 more Primary 4 boys than Primary 5 boys. How many less Primary 5 boys than Primary 5 girls went on the school camp?
| Primary 4 |
Primary 5 |
| 24 |
20 |
| Girls |
Boys |
Girls |
Boys |
| 1 u |
1 p + 16 |
5 u |
1 p |
Total number of students in Primary 4 = 1 u + 1 p + 16
1 u + 1 p + 16 = 24
1 u + 1 p = 24 - 16
1 u + 1 p = 8 --- (1)
Total number of students in Primary 5 = 5 u + 1 p
5 u + 1 p = 20 --- (2)
(2) - (1)
(5 u + 1 p) - (1 u + 1 p) = 20 - 8
5 u - 1 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Number of girls in Primary 5
= 5 u
= 5 x 3
= 15
Number of boys in Primary 5
= 1 p
= 20 - 5 u
= 20 - 15
= 5
Number of less boys than girls in Primary 5
= 15 - 5
= 10
Answer(s): 10
