book Maths Puzzle Numerical Ability

Solve by frist eliminating the decimal numbers.

0.5x + 3.4 = 2.0x + 12.4

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book Other Question

Please help me!
They are fractions 3 over 2w+10 plus 5 over w+5
ADDING
3 5
--------- + --------
2w+10 w+5 I have a problem with this problem, 16-x squared/ x cubed-2x squared-8x