26 Primary 1 pupils and 18 of Primary 2 pupils went on a school camp. The number of Primary 2 boys was 5 times the number of Primary 1 boys, and there were 16 less Primary 2 girls than Primary 1 girls. How many less Primary 2 girls than Primary 2 boys went on the school camp?
| Primary 1 |
Primary 2 |
| 26 |
18 |
| Boys |
Girls |
Boys |
Girls |
| 1 u |
1 p + 16 |
5 u |
1 p |
Total number of pupils in Primary 1 = 1 u + 1 p + 16
1 u + 1 p + 16 = 26
1 u + 1 p = 26 - 16
1 u + 1 p = 10 --- (1)
Total number of pupils in Primary 2 = 5 u + 1 p
5 u + 1 p = 18 --- (2)
(2) - (1)
(5 u + 1 p) - (1 u + 1 p) = 18 - 10
5 u - 1 u = 8
4 u = 8
1 u = 8 ÷ 4 = 2
Number of boys in Primary 2
= 5 u
= 5 x 2
= 10
Number of girls in Primary 2
= 1 p
= 18 - 5 u
= 18 - 10
= 8
Number of less girls than boys in Primary 2
= 10 - 8
= 2
Answer(s): 2
