29 Primary 4 students and 25 of Primary 5 students went on a school excursion. The number of Primary 5 boys was 3 times the number of Primary 4 boys, and there were 14 more Primary 4 girls than Primary 5 girls. How many less Primary 5 girls than Primary 5 boys went on the school excursion?
Primary 4 |
Primary 5 |
29 |
25 |
Boys |
Girls |
Boys |
Girls |
1 u |
1 p + 14 |
3 u |
1 p |
Total number of students in Primary 4 = 1 u + 1 p + 14
1 u + 1 p + 14 = 29
1 u + 1 p = 29 - 14
1 u + 1 p = 15 --- (1)
Total number of students in Primary 5 = 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 boys in Primary 5
= 3 u
= 3 x 5
= 15
Number of girls in Primary 5
= 1 p
= 25 - 3 u
= 25 - 15
= 10
Number of less girls than boys in Primary 5
= 15 - 10
= 5
Answer(s): 5