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You need a 55% alcohol solution. On hand, you have a 275 mL of a 40% alcohol mixture. You also have 80% alcohol mixture. How much of the 80% mixture will you need to add to obtain the desired solution...

Luke is selling tickets to a school play. each adult ticket cost $10 each and child's ticket cost four dollars. Luke sold 87 for the total of 678 how many tickets of each type did Luke sell?

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