1, a store has a batch of washing powder, which sold one-sixth on the first day and more than three-quarters in 80 bags the next day. At this time, the ratio of the number of bags sold to the number of remaining bags is 5: 3. How many bags of washing powder are there in this batch?
80÷ 1- 1/6- 1/6×3/4-3/(3+5)
=80÷5/6- 1/8-3/8
=80÷ 1/3
=240 packs
Or 80 ÷ 5/(3+5)-1/6-1/6× 3/4.
=80÷5/8- 1/6- 1/8
=80÷ 1/3
=240 packs
2. There are 25 people in the sixth grade, three fifths of whom are boys, and a few boys came halfway, accounting for three fourths of the total number of boys. How many boys have become monks halfway?
25×( 1-3/5)÷( 1-3/4)-25
= 10÷ 1/4-25
=40-25
= 15