Q5 of 48 Page 101

In a primary school there shall be 3 teachers to 60 students. If there are 400 students enrolled in the school, how many teachers should be there in the school in the same ratio?

Number of teachers for 60 students = 3

Number of teachers for 400 students = X


The ratio of students = 60:400


The ratio of teachers = 3:X


The ratio of teachers = The ratio of students


60:400 = 3:X


⇒


⇒


⇒X = 20


∴ There are 20 teachers for 400 students in the school


More from this chapter

All 48 →
3

If the compound ratio of 7:5 and 8:x is 84:60. Find x.

 4

The compound ratio of 3:4 and the inverse ratio of 4:5 is 45:x. Find x.

 6

In the given figure, ABC is a triangle. Write all possible ratios by taking measures of sides pair wise.

(Hint: Ratio of AB:BC = 8:6)


 7

If 9 out of 24 students scored below 75% marks in a test. Find the ratio of student scored below 75% marks to the student scored 75% and above marks.