exam Maths Puzzle Numerical Ability

16. As Gary is preparing to move, he notices that several of his smaller packed boxes will fit inside a large one. If each of the smaller boxes is a cube with side length 9 inches,

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I am stumped, and my parents are not much help with this one. I know it should be simple. Here is the question.

Place grouping symbols to make the equation below true.

100-99*3+7*2+1/24=1
1 3 0 1 0
2 -1 4 x 4 -1
0 -2 1 2 1

I can't get this to look right. It is a 3x3 mul by a 3x2
Perform indicated operation. Maybe you can help me und