The library has 140 comic books and 100 story books. Lend out four books every day. How many days later, comic books are three times as big as story books?
(140-100) ÷ (3-1) = 40 ÷ 2 = 20 This will take (100-20)÷4=20 days, please comment. If you agree with my answer, please adopt it in time. ~ Your adoption is the driving force for my progress ~ ~ On 20 17-08- 10, a report from homework help users was launched.