human
Add proper fractions with different denominators which do not share a common factor The fractions in the two circles below add to give the fraction in the circle above.

What should replace the question mark? ![Fractions 3/5 and 1/4 in two separate circles, both linked to a third circle above.]() \( \frac{4}{20} \)
gpt
When adding fractions, changes to common denominator but leaves numerators the same