Question

divide 20 pens between fiza and john in the ratio of 3:2

Answer 1

let the number of pens with fiza be '3x' and with john be '2x'

2x + 3x = 20
5x = 20 
x = 20/5 = 4

∴ number of pens with fiza = 3 * x = 3 * 4 = 12 pens
number of pens with John = 2 * x = 2 * 4 = 8 pens

Answer 2

let the number of pen with fiza and john be 3x and 2x respectively
so,
3x+2x = 20
5x = 20
x = 4
so,
pen with fiza = 12
pen with john = 8