Question

A school has 840 students and 40 teachers. In Year 11, the ratio of the number of pupils who studied chemistry to the number who studied Physics is 3:2. 105 pupils study chemistry, h ow many study physics?

Answer 1

Let x be the no. of physicians

Then,

105/x=3/2

=105×2=3x

=210/3=x

=70=x

Therefore,no. of physicians=70

Proof:

105/70

=21/14

=3:2

Hence proved.