Solution
The correct answer is 17/6
Explanation
Fraction of cake Naina got = $1\dfrac{1}{2}$ = $\dfrac{3}{2}$
Fraction of cake Najma got = $1\dfrac{1}{3}$ = $\dfrac{4}{3}$
Total amount of cake given to both of them = $\dfrac{3}{2}$ + $\dfrac{4}{3}$
= $\dfrac{(3 \times 3) + (4 \times 2)}{6}$
= $\dfrac{9 + 8}{6}$ = = $\dfrac{17}{6}$