book Maths Puzzle Numerical Ability

Sir i need your help, i truly stumped with this one..
How many grams of an alloy containing 35% nickel must be melted with an alloy containing 65% nickel in order to obtain 20 g

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book Other Question

A banker invested $24,000 for a client in two mutual funds, one earning 9% annuaul interest and the other earning 14%. After on year, the total interest earned was $3135. How much please solve the following inequalities as i am having some difficulties:

4x + 12 >= 36 + 4

8z + 4z < 6z - 12

thank you :)