exam Maths Puzzle Numerical Ability

I am haveing the worst time with these inequalities.
9x<5x-28=

3y+2<5y-8=

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exam Other Question

You have a 10 cm cube and you cut the cube into 1 cm pieces, what is the largest cube you can build that looks solid from the outside but is hollow on the inside, and how many pieces would be left over?
Solve for Y
|y+3|-4=7