Question

In an examination hall the ratio of invigilators to the students will be required for 210 students?​

Answer 1

Answer:

Let required invigilators = x

Invigilator : Students

1 : 30

x : 210

x×30/30 = 1×210/30

= 21/3

x = 7

So required invigilators = 7 invigilators (ans)