exam Maths Puzzle Numerical Ability

If 3a + 1 = 13/3, what is the value of 3a-3?

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exam Other Question

A spherical balloon is being inflated. Estimate the rate at which its surface area is changing with respect to the radius when the radius measures 20 cm.

Answer: 160pi cm^2/cm
How do I get it though? Can someone offer some assistance to a 49 year old algebra student?
([2a^2b]/[3x^2y])^3 times ([-6xy^2]/[a^3b])^2