For the box on the left:
-- front side of 4 x 7
-- back side of 4 x 7
-- top side of 3 x 7
-- bottom side of 3 x 7
-- left side of 3 x 4
For the box on the right:
-- front side of 3 x 9
-- back side of 3 x 9
-- top side of 3 x 3
-- bottom side of 3 x 3
-- right side of 3 x 9
-- left side of 3 x 5
Find all the individual area and add them together for the final answer.