26 Primary 3 pupils and 19 of Primary 4 pupils went on a school learning journey. The number of Primary 4 boys was 4 times the number of Primary 3 boys, and there were 16 more Primary 3 girls than Primary 4 girls. How many more Primary 4 boys than Primary 4 girls went on the school learning journey?
Primary 3 |
Primary 4 |
26 |
19 |
Boys |
Girls |
Boys |
Girls |
1 u |
1 p + 16 |
4 u |
1 p |
Total number of pupils in Primary 3 = 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 4 = 4 u + 1 p
4 u + 1 p = 19 --- (2)
(2) - (1)
(4 u + 1 p) - (1 u + 1 p) = 19 - 10
4 u - 1 u = 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of boys in Primary 4
= 4 u
= 4 x 3
= 12
Number of girls in Primary 4
= 1 p
= 19 - 4 u
= 19 - 12
= 7
Number of more boys than girls in Primary 4
= 12 - 7
= 5
Answer(s): 5