2. It takes 16 hours for Party A, 20 hours for Party B, 6 hours for Party A and (12.5) hours for Party B to print a document.
3. The purchase price of a set of summer clothes in a certain store is 200 yuan. If it is sold at 80% of the marked price, you can make a profit in 72 yuan, then the marked price of the clothes is (340) yuan.
The following questions need a process!
4。 Female students in the math extracurricular interest group accounted for 1, and then four female students joined. At this time, the number of female students accounted for half of the whole group. How many people are there in the math extracurricular interest group? (process)
So girls are boys.
1÷ (1-0 of 65438+3) = 0 of 65438+2.
Now girls are all boys.
1 ÷ ( 1- 1) = 1.
Boys have
4 ÷ (1-2 part 1) = 8 (person)
Mathematics extracurricular group originality
8 ÷ (1-31) =12 (person)
A store will increase the cost price of a commodity by 40%, and then mark it. During New Year's Day, it wants a 20% discount, and the price is 244 yuan. What is the cost price of this commodity? (process)
The price tag is
244/80% = 305 yuan.
The cost price is
305÷( 1+40%)= 7 1525 (yuan).
6. There are 62 people in a workshop, and both A and B parts are produced at the same time! Everyone can produce 12 A-type parts or 23 B-type parts every day, if every 3 A-type parts and 2 B-type parts are matched into a set! So how to arrange workers to produce two kinds of parts, so that the two sets of parts produced every day just match? (process)
Suppose there are x people producing part A, then there are (62-x) people producing part B.
Then produce 12 × x parts a.
Production of 23 ×(62-x) pieces of Part B
Three type A parts and two type B parts make a set.
So 12X÷3 = 23(62-X)÷2.
X=46，
62-X= 16
So there are 46 people producing A parts and 16 people producing B parts.