exam Maths Puzzle Numerical Ability

Describe how to compute step function [[x]].

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exam Other Question

A wall of the basement is 32 feet by 8 feet. The wall is to be constructed with masonry blocks that have lengths of 16 inches and widths of 8 inches. About how many masonry blocks are needed to build the wall? Can someone help me on this?

I need to add the following in the lowest terms:

2/7 + 2/7 + 6/7

Thanks, Lyn