45÷( 1+25%)
=45÷ 1.25
=36 people-36 people in the painting group.
There are a batch of new books in the library. On the first day, 32% books were lent out, and on the second day, 45% books were lent out. It is understood that 640 books were lent on the first day. How many books were lent out in two days?
640÷32%×(32%+45%)
=2000×77%
= 1540 copies-two-day loan 1540 copies.
Teacher Zhang bought a teaching reference book during the discount period of the Education Bookstore. Now the price is 16, which is 20% cheaper than the original price. The original price is much.
Less?
16÷( 1-20%)
= 16÷ 0.8
=20 yuan-original price 20 yuan.
4. Xiao Wang reads books. On the first day, he read 20% of the book, and the next day, he read 30% of the book. There are 25 pages left. How many pages are there in this book?
25÷( 1-20%-30%)
=25÷ 50%
=50 pages-This book has 50 pages.
5. Guangming Furniture Factory planned to invest 6.5438+0.5 million yuan, but actually invested 6.5438+0.2 million yuan, which percentage was saved?
( 150- 120)÷ 150
=30÷ 150
= 20%- saving 20%
There are 20 boys in Class 6.6 (1), 25% more than girls. How many more boys than girls?
20÷( 1+25%)×25%
=20 ÷ 1.25×0.25
=4 people. There are four more male students than female students.
7. Grade five students collected 180 cans, and grade six collected 15% more than grade five. How many cans were collected in the sixth grade?
180×( 1+25%)
= 180× 1.25
=225-225 cans of sixth grade collection.
8. There is a barrel of oil. For the first time, 25% of the whole barrel of oil was poured out, for the second time, 40% of the whole barrel of oil was poured out, and for the second time, 26kg was poured out. How many kilograms is this barrel of oil?
26÷(25%+40%)
=26÷ 0.65
=40 kilograms-this barrel of oil was originally 40 kilograms.
9. There are 40 more peach trees than apricot trees in the orchard, and the number of apricot trees is 80% of peach trees. How many peach trees and apricot trees are there respectively?
40÷( 1-80%)
=40÷0.2
=200-200 peach trees.
200-40= 160- 160 apricot tree.
10. The orchard harvested 210.6 tons of fruit this year, an increase of 80% over last year. How many tons of fruit were added last year?
2 1.6÷( 1+80%)×80%
=2 1.6÷ 1.8×80%
=9.6 tons-the fruit output has increased by 9.6 tons this year.