27 Primary 1 pupils and 22 of Primary 2 pupils went on a school oversea trip. The number of Primary 2 boys was 4 times the number of Primary 1 boys, and there were 14 less Primary 2 girls than Primary 1 girls. How many less Primary 2 girls than Primary 2 boys went on the school oversea trip?
Primary 1 |
Primary 2 |
27 |
22 |
Boys |
Girls |
Boys |
Girls |
1 u |
1 p + 14 |
4 u |
1 p |
Total number of pupils in Primary 1 = 1 u + 1 p + 14
1 u + 1 p + 14 = 27
1 u + 1 p = 27 - 14
1 u + 1 p = 13 --- (1)
Total number of pupils in Primary 2 = 4 u + 1 p
4 u + 1 p = 22 --- (2)
(2) - (1)
(4 u + 1 p) - (1 u + 1 p) = 22 - 13
4 u - 1 u = 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of boys in Primary 2
= 4 u
= 4 x 3
= 12
Number of girls in Primary 2
= 1 p
= 22 - 4 u
= 22 - 12
= 10
Number of less girls than boys in Primary 2
= 12 - 10
= 2
Answer(s): 2