book Maths Puzzle Numerical Ability

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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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/ The two biggest lakes in Manitoba are lake Winninpeg and Lake Brandon. Their combined area is about 29800 km^2. The area of lake Brandon is 700 km^2 less than one quarter of the area of lake Winnipeg. What is the area of each lake?