1/2 + 2/5 = 5/10 + 4/10 = 9/10
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Imagine that 1 box = 1000 blocks.
It'll be 2 boxes, 4 cases, 1 stack, and 0 single blocks.
Answer: 
Step-by-step explanation:
The surface area of a rectangle can be calculated with:

The surface area of a trapezoid can be calculated with:

Calculate the area of the base, wich is a rectangle:

There are two equal rectangles, therefore, multiply the area of any of them by 2:

Calculate the area of the other rectangle:

There are two equal trapezoids, therefore, multiply the area of any of them by 2:

Therefore, the surface area will be the sum of all the areas calculated:
