exam Maths Puzzle Numerical Ability

How do I work this problem?
-2[4-3(x+5)]>4(2-x)

-2(x-2)=2[x-4(x-2)+x]

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exam Other Question

Solve for y in the following equations:

1. 25x-5y=15
y=_______

2. 18x+6y=(-12)y
y=_______ A pharmacist needs 70 liters of a 50% alcohol solution. She has availible a 30 % solution and an 80% solution. How many liters of each solution should she mix to obtain 70 liters of a 50% alcohol solution ?

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