exam Maths Puzzle Numerical Ability

How do you perform the indicated operation? (5 + 2i)(2 - 3i)

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exam Other Question

the sum of the digits of a three digit number is 11. if the first and last digits are interchanged, the new number is greater than the original number by 594. if the tens and the u OK, I am banging my head on my desk over this one!

I have 27 coins in nickles, dimes and quarters. There are five more dimes than nickles. The total value of the coins is $3.55. What is the number of quarters?

Ugg! Please help, thank you