Let the number of pens with Sujay = x
So, number of pens with Ram = 20−x
As per question,
Ratio between Sujay and Ram = 4:1
⇒ x20−x=41
⇒ x=4× (20−x)
⇒ x=80−4x)
⇒ x+4x=80
⇒ 5x=80
∴ x=16
So, the number of pens with Sujay = x = 16
And, the number of pens with Ram = 20−x = 4