If a book is priced at 15 yuan, you can get 50% after it is sold. If you sell it at a 20% discount, you can make a profit______ Yuan

If a book is priced at 15 yuan, you can get 50% after it is sold. If you sell it at a 20% discount, you can make a profit______ Yuan

15 (1 + 50%) = 15 (150%), = 10 (yuan); 15 × 80% - 10 = 12-10, = 2 (yuan); a: it can make a profit of 2 yuan

50 numbers in English

onetwothreefourfivesixseveneightnineteneleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwentytwenty-onetwenty-twotwenty-threetwenty-fourtwenty-fivetwenty-sixtwenty-seventwenty-eight...

If x = 7Y, then x: y = (): () if 7 / 12 of x equals 5 / 6 of Y, then x: y = (): ()

If x = 7Y, then x: y = (7): (8)
If 7 / 12 of X is equal to 5 / 6 of Y, then x: y = (10): (7)
5/6 : 7/12 = 10 : 7

Find out the mistakes in the following sentences and correct them
I read a interesting storybook yesterday.
I will go to Guangzhou to see my grandma with my family yesterday.
There were no factories 50 years ago.There weren't many people,also

The correct answer is:
1 A to an
2. Change yesterday to tomorrow
3 also to either
★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆

Is 1900 a leap year? Why?
Why should the following two zeros be divided by 400? 1904 is a leap year, so 1900 is also a leap year. If 1900 is not a leap year and 1904 is ten years away from the next leap year, how many years is the leap year?

It is stipulated that the year of the Gregorian calendar is the whole hundred, and it must be a multiple of 400 to be a leap year. If it is not a multiple of 400, it is a normal year

What's one-third plus minus two and one-third

-2
It's one-third minus two and one-third

The water content in children's body is about 4 / 5 of their weight. Xiaoming's weight is 46 kg. Xiaogang's weight is 15 / 16 of Xiaoming's weight. What's the water content in Xiaogang's body?
The score is expressed in Chinese characters!

46 times 15 out of 16 times 4 out of 5 = 34.5

English translation
Each is two

five past four
a quarter past five
twenty past six
half past seven
twenty to nine
a quarter to ten
ten to eleven
a quarter to four
eleven past eleven
seven past two

When using scissors to cut thick paper, the tip of the scissors is not easy to cut, but the middle of the knife is easy to be short. Why?
What is the relationship with the resistance arm?
Why is the shorter the resistance arm, the less the force?

The distance from the middle of the scissors to the fulcrum is certainly shorter than that from the tip of the knife to the fulcrum
According to L1 * F1 = L2 * F2
The shorter the resistance arm, the less effort
So when using scissors to cut thicker paper, the middle part of the knife is easy to cut

In a cylindrical bottle with a bottom radius of 10 cm, the water depth is 8 cm. To put a piece of iron in the bottle, which is 8 cm in length and 15 cm in width and 15 cm in height, how many cm does the water surface rise when the iron is placed vertically in the water?

3.14 × 102 × 8 ^ (3.14 × 102-8 × 8) - 8, = 2512 ^ 250-8, = 10.048-8, = 2.048 (CM), a: the water surface has risen by 2.048 cm