exam Maths Puzzle Numerical Ability

I need help in evaluating the following expressions: Thanks in advance.

1. 53 - 3(2^5 - 22)


2. (5 * 2)^3


3. 10 - 3*(8 - 6)


4. 5 - 2^3

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exam Other Question
A grocer wants to mix peanuts and cashews to produce 20 lb of mixed nuts worth $6.20/lb. How many pounds of each nut should she use if peanuts cost $4.80/lb and cashews cost $8/lb? SOlve:

x 5
---- +1 = ----
x-5 x-5

This problem has no solution correct? Thank you for your help :-)