Answer:
or

Explanation:
Ratio is defined as the comparison between the two sizes.
a:b = a/b
We have to find the ratio for 42 pens : 35 pencils as a fraction:
Given:

By definition:
⇒

Divide numerator and denominator by 7 we get;

Therefore, the ratio for 42 pens : 35 pencils as a fraction is,
or
