Answer: He needs more strawberries than banana.
Explanation:
Since we have given that
Number of cups of mashed bananas is given by

Number of cups of mashed strawberries is given by

We need to find whether he needs more bananas or more strawberries.
For this we need a common denominator.
1) Taking L.C.M. of denominator :
L.C.M. OF 6 and 4 = 12
2) Make the common denominator i.e. 12 for both the fractions.

so, we can see that

He needs more strawberries than banana.