exam Maths Puzzle Numerical Ability

If the average of six numbers is 18 and the average of three of the numbers is 15 then what is the sum of the remaining three numbers ? Need help on how to set this up and how to figure it...Thanks so much..

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exam Other Question

(3x-1)+(3x+1)+4 first part underlined by 9, second by 3 The Coin Shop will purchase at most $20.00 per person per day in silver coins, provided that the are packaged in sets of 6 nickels, 4 dimes, and 1 quarter. What is the greatest number of sets that Steve could bring to the shop to sell?