Xiao Jun read a story book. On the first day, he read 15% of the whole book. On the second day, he read 12% of the whole book. There are 146 pages left? (find out the unit "1" relation
Suppose there are x pages in the whole book
A: the story book has 200 pages
Xiao Jun read a story book. He read 22 pages on the first day and 28 pages on the second day, leaving 60% of the book unread. How many pages are there in total?
22 + 28 = 50 pages
50 / 0.4 = 125 pages
NEXT: Li Ming bought a story book. On the first day, he read 25% of the whole book, and on the second day, he read two fifths of the whole book. There are still 42 Pages left. How many pages are there in this book? There are 7200 peach and pear trees in an orchard. The number of peach trees is 4 / 5 of that of pear trees. How many peach and pear trees are there in this orchard?