40(3/5-2/5)= 200 cars
There are 200 bicycles in this batch.
7. The ratio of science and technology books to story books in the school library is 5:8, and the number of science and technology books is less than story books 120. How many literary books and comic books are there?
120 ÷ (8/13-5/13) = 520 (Ben). . . . . . total
520×8/ 13=320。 . . . . . A story book.
520×5/ 13=200。 . . . . . A science and technology book
A: There are 320 stories and 200 science and technology books respectively.
8. Make a rectangular frame with the ratio of length, width and height of 5: 3: 2 with 80cm wire. What is the length, width and height of this frame?
80÷4=20 cm
5+3+2= 10
20×5/ 10= 10 cm. . . . . . long
20×3/ 10=6 cm. . . . . . extensive
20×2/ 10=4 cm. . . . . . high
9. There is a circular fountain in the Oriental Plaza, with a circumference of 37.68 meters. How many square meters is the area?
3. 14×(37.68÷3. 14÷2)? = 1 13.04
10. the diameter of the circular garden is 10m, and the width of the circular road outside the garden is1m. How many square meters is the circular path?
3. 14×(5+ 1)? -3. 14×5? =34.54
12. There are 380 students in Yucai Primary School who participated in the interest activity group, and 5% students did not participate in the interest activity group. How many students are there in Yucai Primary School?
13. Red Star Shoes Factory completed 4/7 of the annual plan in the first half of the year and 3/5 of the annual plan in the second half. Results Overfulfilled 1200 pairs. How many pairs are planned to be produced throughout the year?
14. The water consumption of a factory 10 in October 132 tons, less than that in September 13 tons. What percentage was saved?
15. The original batch of grain in the warehouse was shipped out and brought in 45 tons. At this time, the ratio of grain to raw grain in the warehouse is 5: 4. How many tons of grain are there in the warehouse?
16. Every 3 yuan, shops have activities. Buy ten and get one free in store A, and get a 15% discount when store B is over 100 yuan. Miss Wang wants to buy 35 such notebooks. Which store is cheaper for him to buy?