2. If the purchase price of a commodity is 1500 yuan, the price shall be marked after the price is increased by 40%. If it is sold at a discount, so its profit is 20%, then this product is sold at a discount.
3.70%x + 55%(30-x) = 30×65%
1. A math test paper has 20 multiple-choice questions, and you are required to get 5 points for doing one question correctly, and you will get 5 points for not doing it or making a wrong deduction 1 point. As a result, a student got 76 points. Do you know how many questions he answered correctly?
Chicken and rabbit are in the same cage, with 9 heads above and 26 feet below. How many chickens and rabbits are there?
3. A bookstore launched a discount card in the promotion. 20 yuan, you can get a 20% discount on books with this card. Once, Li Ming went to the bookstore to buy books. When checking out, he first bought a discount card and then paid with it, saving 12 yuan. So what is the total value of the books that Li Ming bought this time?
4. It takes 65,438+05 days for A to do a job alone, and 65,438+00 days for B to do a job alone. If A does it for five days first, how many days will it take for two people to do it together?
Questioning questions with intransitive verbs (5 points for each question, *** 15 points):
1. The equation about x (2k-1) x2-(2k+1) x+3 = 0 is a linear equation, so what is the value of k?
There are four dates in a month's calendar, and the sum of the second date and the fourth date is 36. What is the third date?
3. If the 5th of a month is Tuesday, what day is the 20th of this month?
5.( 12) There are some identical rooms that need painting. Three masters painted eight rooms a day, and as a result, the 40㎡ wall was not painted in time; Meanwhile, five apprentices painted the walls of nine rooms. Each master draws 30㎡ more walls than his disciples.
(1) Find the wall area to be painted in each room;
(2) Boss Zhang has 36 such rooms that need painting. If 1 master is invited to take two apprentices, how many days will it take?
(3) It is known that the daily wages of master and apprentice are 85 yuan and 65 yuan respectively. Boss Zhang asked to finish it in three days. How to recruit people from these eight people?
6.(9 points) Raw material suppliers implement the following preferential measures for customers who purchase their raw materials:
(1) If the one-time purchase amount does not exceed 1 ten thousand yuan, no discount will be given;
(2) If the one-time purchase amount exceeds 654.38+00000 yuan, but does not exceed 30000 yuan, all of them will be given a 10% discount;
(3) If you buy more than 30,000 yuan at one time, you will get a 10% discount for 30,000 yuan, and a 20% discount for the part exceeding 30,000 yuan.
Because of the storage capacity, someone paid 7800 yuan for the first purchase of raw materials from a supplier, and 26 100 yuan for the second purchase. How much should he pay if he buys the same amount of raw materials at one time? How much can I pay less?
Answer;
1, assuming that x machines were originally planned.
(X/ 13)+ 10 =(X+60)/ 12
Answer: x = 780 (unit)
So we originally planned to make 780 sets.
2. Suppose the goods are sold at x%
1500( 1+40%)x % = 1500( 1+20%)
x = 85
So it's 15% off.
Suppose you do x correctly.
5x-(20-x)= 76
x = 16
So, I got it right 16.
4. Set X chicken and Y rabbit.
x+y = 9
2x+4y = 26
2x+2y = 18
2y = 8
Y = 4 (only)
X = 5 (only)
So, there are five chickens and four rabbits.
5. Set the total book price as X yuan.
20+0.8x+ 12 = x
X = 160 (yuan)
So the total value of books is 160 yuan.
6. [1-(5/15)]/(110+115) = 4 (days)
Therefore, it will take four days to complete.
7. Since it is a linear equation, 2k- 1 = 0, so k = 1/2.
8. If the first date in the column is X, the second date is x+7, the third date is x+ 14, and the fourth date is x+2 1.
X+7+x+2 1 = 36, then x = 4, so the third date is 18.
The 9th and 5th are Tuesdays, so 12 and 19 are Tuesdays, so the 20th is Wednesday.
10, (1) If the master draws a wall of m2 every day, the apprentice draws a wall of -30.
8*5*(a-30)/9 = 3a+40
A = 120, then 5(a-30)/9 = 50, and the wall to be painted in each room is 50 square meters.
(2) 36 rooms with an area of * * 36*50 = 1800.
1800/(120+2 * 90) = 6 (days), so it will take 6 days to complete Mr. Zhang's room.
(3) Ask Teacher X and Apprentice Y.. When it is finished in three days,
120 x+90y = 1800/3(= 600)
That is, 4x+3y = 20. If it is to be completed in three days, X is greater than or equal to (20-3y)/4. Because X is greater than or equal to 0, Y is an integer from 0 to 6, and X is also an integer, so Y can only be 4.
So please hire two masters and four apprentices with the least salary.
1 1, 7800 yuan for the first time, no discount possible.
For the second time, RMB 26,654,38+0,000 Yuan. In the second discount (calculated that it can't be the third discount), the original price is set at RMB X.
0.9x = 2.6 1, so X = 29,000 yuan.
0.78+2.9 = 36,800 yuan, then the discounted price = 3 * 0.9+0.68 * 0.8 = 32,440 yuan = 32,440 yuan.
I've given you all the answers, so tired ~ ~ ~ Choose me as the answer, hehe ~