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Solve practical problems in primary school mathematics
Solution: Let the number of 5 yuan and 10 yuan be X, then there is 1 18-2X in 2 yuan.

2 *( 1 18-2X)+5X+ 10X = 500

236-4X+5X+ 10X=500

236+ 1 1X=500

1 1X=500-236

1 1X=264

X=24

1 18-2*24=70

70 tickets for 2 yuan and 24 tickets for 5 yuan, 10 RMB.

Analysis:

The ratio of read pages to unread pages is 1: 5, which means that the ratio of read pages to books is1:6 =1/6;

The ratio of read pages to unread pages is 3: 5, which means that the ratio of read pages to the whole book is 3: 8 = 3/8.

The proportion of reading books changed from 1/6 to 3/8, because I read 30 pages.

30 ÷ (3/8-1/6) = 30 ÷ 5/24 =144 pages-how many pages does this book have * *?