26 Primary 1 pupils and 22 of Primary 2 pupils went on a school oversea trip. The number of Primary 2 girls was 3 times the number of Primary 1 girls, and there were 12 more Primary 1 boys than Primary 2 boys. How many less Primary 2 boys than Primary 2 girls went on the school oversea trip?
| Primary 1 |
Primary 2 |
| 26 |
22 |
| Girls |
Boys |
Girls |
Boys |
| 1 u |
1 p + 12 |
3 u |
1 p |
Total number of pupils in Primary 1 = 1 u + 1 p + 12
1 u + 1 p + 12 = 26
1 u + 1 p = 26 - 12
1 u + 1 p = 14 --- (1)
Total number of pupils in Primary 2 = 3 u + 1 p
3 u + 1 p = 22 --- (2)
(2) - (1)
(3 u + 1 p) - (1 u + 1 p) = 22 - 14
3 u - 1 u = 8
2 u = 8
1 u = 8 ÷ 2 = 4
Number of girls in Primary 2
= 3 u
= 3 x 4
= 12
Number of boys in Primary 2
= 1 p
= 22 - 3 u
= 22 - 12
= 10
Number of less boys than girls in Primary 2
= 12 - 10
= 2
Answer(s): 2
