book Maths Puzzle Numerical Ability

Okay, I lied, I have one more:
Could someone please help me?
I really need help to reduce this problem into lowest terms by performing the indicated operation:
5/3a-9 -3/2a + 4/

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book Other Question

A chemist wants to mix 33% and 43% alcohol solutions to make 30 liters of 37% alcohol solution. How many liters of 33% alcohol solution is necessary? Marcos age in years is 4 times his baby brothers age in months. next year the baby's age in months will be one less than marcos age in years, how old is marco?

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