book Maths Puzzle Numerical Ability

Subtract. Reduce answer to simplest form.

(2)/(5w + 10) minus (3)/(2w - 4)

Thanks!

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book Other Question

I just can’t remember how to do this, the ratio of two numbers in 5/6. The second number is 16 less than twice the first number. I have to find both numbers and I need your help!
-thanx
J.B
Two workers can trim 400 meters of hedge in 10 hours. how long will it take 5 workers to trim 600 meters of hedge?
______hours.

Thank You.