For an amusement park, 7 children and 2 adults cost 51 yuan, while 20 children and 3 adults cost 114 yuan For the tickets of an amusement park, 7 children and 2 adults need 51 yuan; 20 children and 3 adults need 114 yuan. But if more than 10 children buy tickets together, the children's tickets will be 10% off. How much are the tickets for adults and children before the discount?

If the adult ticket is x yuan, the child ticket is (51-2x) / 7 yuan,
20(51-2X)/7×0.9+3X=114
18(51-2X)+21X=114×7
918-36X+21X=798
15X=120
X=8
(51-2X)/7=5
Adults, children were 8 yuan, 5 yuan

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