Question

Engenders and doctor are in ratio 2:5 if there are 18 engineers find the number of doctors if there are 65 doctors find the number of engineers

Answer 1

Answer for the first one is 45 doctors.

Answer for the second one is 26 engineers.

               Engineers        Doctors

                    2            ->         5

                     18           ->          x

                x = (5*18)/2

                x = 45 doctors.

  Same for the second one also.

Answer 2

$ratio \: of \: engineers \: and \: doctor \: = \frac{2}{5}$
let no. of doctors be x
$\frac{2}{5} = \frac{18}{x}$
$x = 5 \times 9$
$x = 45 \: doctors$
now,
let no. of engineers be y
$\frac{2}{5} = \frac{y}{65}$

$y = 2 \times 13$
$y = 26 \: engineers$


hope this helps you