In this question, we have

Terms of 3: 2 are 3 and 2

Therefore,

Sum of these terms = 3 + 2 = 5

Also,

Sheela will get of total pens and Sangeeta will get  of total pens

Hence,

Number of pens with Sheela = × 20 = 12

Also,

Number of pens with Sangeeta = × 20 = 8