( 1800- 1000)÷8%
=800÷8%
= 1 ten thousand yuan
2. The circumference of the circular flower bed is 37.68 meters, and chrysanthemum and string red are planted in the flower bed according to the area ratio of 2: 1. How many square meters are there for planting chrysanthemums and red flowers?
The radius is 37.68 ÷ 3. 14 ÷ 2 = 6m.
The area of chrysanthemum is 3.14× 6× 2/(2+1) = 3.14× 24 = 75.36 square meters.
String red 75.36÷2=37.68 square meters
3. Wang Jun made a survey of students' extracurricular activities and drew a fan-shaped statistical chart (study: 34%, physical exercise: 39%, sleeping: 3%, playing computer: 8%, reading extracurricular books: 16%). He found that only six students slept in their spare time. There are (200) students in Wang Jun's class.
6÷3%=200 people 2) There are 50 people who read extracurricular books less than those who take part in physical exercise.
200× (39%-16%) = 200× 25% = 50 people.
4. Solve the equation
( 180-X)/ 180 = 1/5
180-X=36
X= 180-36
X= 144
5. Simple calculation 1) 2/7-9/7+5/7-9/4
=(2/7+5/7)÷4/9
= 1÷4/9
=9/4
=2 and 1/4
2)63* (2/7- 1/2 1) ÷ 1 1/ 13
=(63*2/7-63* 1/2 1)÷ 1 1/ 13
=( 18-3)÷ 1 1/ 13
= 15÷ 1 1/ 13
= 195/ 1 1
= 17 and 8/ 1 1