28 Primary 1 students and 25 of Primary 2 students went on a school learning journey. The number of Primary 2 girls was 3 times the number of Primary 1 girls, and there were 13 more Primary 1 boys than Primary 2 boys. How many more Primary 2 girls than Primary 2 boys went on the school learning journey?
| Primary 1 |
Primary 2 |
| 28 |
25 |
| Girls |
Boys |
Girls |
Boys |
| 1 u |
1 p + 13 |
3 u |
1 p |
Total number of students in Primary 1 = 1 u + 1 p + 13
1 u + 1 p + 13 = 28
1 u + 1 p = 28 - 13
1 u + 1 p = 15 --- (1)
Total number of students in Primary 2 = 3 u + 1 p
3 u + 1 p = 25 --- (2)
(2) - (1)
(3 u + 1 p) - (1 u + 1 p) = 25 - 15
3 u - 1 u = 10
2 u = 10
1 u = 10 ÷ 2 = 5
Number of girls in Primary 2
= 3 u
= 3 x 5
= 15
Number of boys in Primary 2
= 1 p
= 25 - 3 u
= 25 - 15
= 10
Number of more girls than boys in Primary 2
= 15 - 10
= 5
Answer(s): 5
