Mathematics for IGCSE & O level - Ratio And Proportion (Section 4 - No. 30)
In a school, the ratio of students to teachers is 20:1. If there are 500 students, how many teachers are there?
10
20
25
50
Explicació
Since the ratio of students to teachers is 20:1 and there are 500 students, there will be 500/20 = 25 teachers.