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Math puzzles … Can you help?

Math 220 Social Club has 500 members in total. For an upcoming event, the Tickets are $ 20 for premium members and $ 14 for regular members. All regular members have participated, but only 70% of the members of premium wine. How to take a club (= "income") in ticket sales? This is not a trick question. You can find the answer, but you have to think much. That's what teachers say and I think he was right. Thank you all for the answers.

500 members in total entries. were $ 20 for the "award" members and $ 14 for regular members. All regular members have participated, but only 70% premium members arrived. r = reg. Members 500 – r = r premium members (14) = total price of all the reg. 0.70 members (20) (500 – r) = total price of all premium members 14R + (0.7) (20) (500 – R) = 14r + 14 (500 – R) = 14r + 7000 – $ 7000 = 14r

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