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The first grade math intelligent application problem (1) provides quick rewards!
Solution: Set the ticket for Xuanwu Lake as X and the ticket for Sun Yat-sen Mausoleum as Y.

Available:

20X+30Y equals 450.

30X+ 15Y equals 525.

Solution: x equals 15.

Y equals 5.

So: Xuanwu Lake tickets 15 yuan, Sun Yat-sen Mausoleum tickets 5 yuan.

PS: The keyboard indicates that the key is broken. Sorry.