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 * *?