Question

in a primary school there shall be 3 teacher to 60 students then how many teachers for 400 students

Answer 1

If 3:60 then x:400

Mulltiply 3 and 400 and x by 60

1200=60x

divide both sides by 60

x=20

therefore 20 teachers are needed

Answer 2

3×400=x×60
1200=60x
x=20