book Maths Puzzle Numerical Ability

Please help me!
They are fractions 3 over 2w+10 plus 5 over w+5
ADDING
3 5
--------- + --------
2w+10 w+5

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book Other Question

evaluate or simplify

(27y^9)^-1/3

I am at a lost please help
Solve by frist eliminating the decimal numbers.

0.5x + 3.4 = 2.0x + 12.4