book Maths Puzzle Numerical Ability

Please help.
Subtract and write answer in simplest form.

y-2/y+3 - y/2y+6

I am getting y-4/2(y+3)

Is this right?

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book Other Question

I think I have the answer---But not the formula. I've worked on this for days, HELP PLEASE!!!!!!!!!
Alex has four bags weighing 1,2,3 and 4 pounds. To arrange them, he will pic What percent of total waste deposited in landfills is household refuse?

these are in million tons

soil 107.6
wood 87.6
concrete 22.5
household refuse 32.7

So I take th