Data Sufficiency (DS) | A teacher distributed few pens and few pencils evenly among the studen

Statement 1:
180 Pens and 40 Pencils were distributed.
So number of students must be factor of HCF(180,40) => factor of 20
still not suff

Statement 2: clearly insufficient.

Combining 1 + 2

If we take factor 10, number of pen received by students = 180/10 = 18 (which is greater than 15), which contradicts statement 2
so number of students must be greater than 10,
only factor of 20 greater than 10 is itself.

so number of students = 20 (C)

---