Mischievous read a story book. He read 20% of the whole book on the first day, and 24 more pages on the second day than on the first day. Now the number of pages he has read is higher than that he has not read 4: 3. How many pages altogether? (the explanation should be more detailed, and the equation process should also be written when the equations are listed.)

Mischievous read a story book. He read 20% of the whole book on the first day, and 24 more pages on the second day than on the first day. Now the number of pages he has read is higher than that he has not read 4: 3. How many pages altogether? (the explanation should be more detailed, and the equation process should also be written when the equations are listed.)


4 + 3 = 7
Set the book on page X
4/7X=20%X+20%X+24
4/7X-2/5X=24
6/35X=24
X=24×35/6
X=140



Xiao Fang read a story book. On the first day, he read one third of the whole book. On the second day, he read another 10 pages. At this time, the number of pages he read accounted for two-thirds of the total,
Which page should we start on the third day?


Now we have seen that = 2 ÷ (2 + 3) = 2 / 5, all = 10 ÷ (2 / 5-1 / 3) = 150 pages, the third day = 150 × 1 / 3 + 10 + 1 = 61 pages, and the third day should start from page 61



Xiao Fang plans to finish reading a story book in three days. He read 40% of the whole book on the first day, and the ratio of the number of pages read on the second day to the third day is 5:7
It is known that the second day I read 15 pages less than the first day. What is the total number of pages in this book? Let's calculate the formula!


If the total number of pages is x and the number of pages viewed the next day is y, then the number of pages on the third day is 1.4y
0.4x+y+1.4y=x
0.4x-y=15
The solution is x = 100

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