solve problems

1 The yield of rice is 70%. How many kilograms of rice does it take to process 2 10 kilograms of rice?

2 10/70%=300 (kg)

A company wants to recruit 120 employees, and 200 people applied. What percentage of people can't be hired?

(200- 120)/200* 100%=40%

3 A story book, Xiao Ming read 40 pages, which is just 12.5% of the book. How many pages are left?

40/ 12.5%-40=280 (page)