25% of a number is 15 less than 3 / 4 of 120?
Let this number be X
x×25%+15=120×3/4
0.25x=90-15
0.25x=75
x=300
A: the number is 300
Subtract 1 / 2 of a number from 120 to get 40. Find the number
Let this number be X
120-1/2x=40
1/2x=80
x=160
A: the number is 160
If you don't understand, please ask
RELATED INFORMATIONS
- 1. Solve the equation 120-156x = 40
- 2. It is known that the first digit of the three digits is 8, but the last two digits don't know. There are six empty digits, which can only be selected from 1 to 6
- 3. The difference between 2 times of a number and 12 is equal to the opposite number of the number
- 4. The sum of 3 / 4 + 1 / 2 is equal to 15 / 16 of a number
- 5. A number minus one-third of it is equal to one-fourth. Find the number
- 6. One sixth of a number is exactly equal to four ninth of 36. This number is ()
- 7. 80% of 30 is equal to 2 / 3 of what
- 8. Yuanyuan wrote two numbers. The difference between the two numbers is exactly equal to the product of the two numbers. One of them is 0, 36, and the other is?
- 9. One in three is a few in 36
- 10. 1. What is the number that is one sixth more than 30? What is the number that is two and three fourths less than 36?
- 11. X 9 = learn to count, love me
- 12. Five mathematical problems about the use of numbers practical problem 1. Chen Lin deposits 6000 yuan in the bank for one year with an annual interest rate of 4.14%. How much is the total amount of principal and after tax interest due? (interest tax is calculated at 5%) 2. For a book, Xiao Hong read 25% of the whole book on the first day, 18 pages on the second day, and 66 pages left. How many pages are there in this book? 3. The school bought a total of 80 basketball and ball, the number of basketball is 60% of the ball? 4. (1) there were 2500 classes of planting trees in a forest farm last year and 1900 classes of planting trees this year. How many percent less than last year? (2) There were 2500 classes for tree planting in a forest farm last year. The number of trees planted this year is 24% less than that of last year. How many classes are there for tree planting this year? (3) There were 2500 classes of tree planting in a forest farm last year, which was 24% less than last year. How many classes of tree planting last year? 5. A steel pipe used 1 / 4 of it for the first time, and 1 / 3 of it for the second time. Two times, it just used half of the steel pipe. How many meters of the steel pipe used to be
- 13. Fun Garden: love math from childhood × 3 = love math from childhood = () small = () love = () good = () number = () learning = ()
- 14. On the right is a multiplication formula, each box is filled with a number, and each Chinese character represents a number. Different Chinese characters represent different numbers. If the number represented by "total" is greater than 2, then the three digits represented by "finals" are______ .
- 15. Multiplication formula of Grade 8 math 15.2 The teacher wrote three formulas on the blackboard: 5 ^ 2-3 ^ 2 = 8 * 2, 9 ^ 2-7 ^ 2 = 8 * 4, 15 ^ 2-3 ^ 2 = 8 * 27. Wang Hua then wrote two formulas with the same rule: 11 ^ 2-5 ^ 2 = 8 * 12, 15 ^ 2-7 ^ 2 = 8 * 22 (1) please write another two (different from the above formula) with the above rules. (2) write the rules reflecting the above formula in words
- 16. Help me to do some multiplication formula application 1. Calculate the second power of 3000 - the second power of 2999 + the second power of 2998 - the second power of 2997 +. + the second power of 4 - the second power of 3 + the first power of 2 - the second power of 1 2. It is known that a.b.c.d are all positive numbers, and the fourth power of a + the fourth power of B + the fourth power of C + the fourth power of D = 4abcd. It is proved that a = b = C = D
- 17. When the following Chinese characters represent what number, the vertical form on the right holds? (Note: each character represents a number, different characters represent different numbers, and the same character represents the same number.) Beauty = () River = () good = () mountain = () Beautiful rivers and mountains × 9 —————— Beautiful mountains and rivers
- 18. In the following vertical, different Chinese characters represent different numbers, and the same Chinese character represents the same number What number does each character represent when the following vertical form is established? × 9 ————— Learn to count, love me, uncles and aunts, brothers and sisters, grandparents help
- 19. Master Li has processed 80% of a batch of parts, and there are still 24 parts left to be processed. How many parts are there in total? Match the right phrases The joy of growing up Add two synonyms to each word Overflow - () () Take a guess A green meadow Here comes a flock of sheep The furthest parting (idiom)
- 20. Solving two math problems (3 minutes) 1. Given a = 2x2 power + 3xy-2x-1, B = - x2 power + XY-1, and 3a + 6B has nothing to do with X, find the value of Y (requires formula and answer) 2, three consecutive even numbers, the middle one is 2n, arrange the three numbers from small to large, and get a three digit number. When n is the value, the three digit value is the maximum, and find the maximum value. (formula Plus answer) fast, time limit is three minutes