The number A is two fifths of the number B, and the number A is what is the number B

If the number A is two-fifths of the number B, then the number B is the number of A (five-two).

If salt makes up one-eighth of the brine, then the ratio of salt to water is (1:7).

A box of apples is 30kg, and three-quarters of it is sold, how many kilograms are left? In the problem, (the total mass of this box of apples) is regarded as the unit "1", and the remaining apples account for (one-quarter) of the total mass, and how many kilograms are left is to find (what is a quarter of this box of apples), which should be calculated by (multiplication 30*quarter).

A refrigerator can be sold at a price of 650 yuan, if you get a 20% discount**, the loss is 480 yuan, how much is the purchase price of this refrigerator?

Replace ideas to solve problems.

Let's say the price of the refrigerator is x and the purchase price is y

then x-y=650

Add the two formulas and subtract y

x=5650

2 - 6 out of 13 9 out of 26 - 2 out of 3.

A number divided by a fraction is equal to the number multiplied by the reciprocal of this fraction.

This formula = (6 13 ) 26 9) -(2 3) ps: You should pay more attention to your math It's a little bit of a problem to go on like this.

The number A is 2 5 times the number B, and the number B is 5 2 times the number A.

Analysis: A B 2 5, B A 5 2.

The number A is three-fifths of the number B, then the number B is the number A repent (5 3)1The number A is three-fifths of the number B, and if the number B is regarded as the unit 1, then the number A is 3 5

The pre-disturbance of the number B is the number A: 1 3 5 = 5 3

2..The number A is three-fifths of the number B, which can be seen as the number B is 5 parts, and the number A is 3 parts.

The number B is the number of A: 5 3 = 5 3

This kind of problem is usually given a special value. For example, let B be 5, and from the title, A can be seen to be 4. So B is 5 4 of A. The same beginning is 5 9 which is the sum of the two numbers A and B.

Method 2, there is a question that A is equal to five-quarters than B, and it is equal to K. We can get that A is equal to 4k and B is equal to 5k. So B is 5 4 of A. B is the sum of the two numbers A and B 5 9.

This problem is usually to have a special value as a denominator.

Melt away. Get the final result. Or make his pen value equal to another number, so as to solve the value of two numbers. In the comparison, get the final result.

The number A is 4 5 of the number B, the number B is the number of A (5 4), and the number B is the sum of the numbers A and B.

5 (5 10 4) i.e. 5 9.

The number A is two-fifths of the old talk of the number of B, and the number A is 8

Then number B = 8 five regiments contain two good parts.

If the number B is 1, then the number A is 4 5

The number B is the number of A: 1 4 5 = 5 4....The number of shouts in hole B is 4 points of the number of A, and the number of ants trembles and 5

Let B be x, A is three-fifths of x, divide three-fifths of the year by x and add three-fifths of the quarrel x, and simplify it to get eight points and three of filial piety.

If number B is four-fifths of number A, then number A is five-fourths of number B, which is one hundred and twenty-five percent.

B is poor = A"4/5"

A = B * 5 4

B * 5 * 25 4 * 25

B 125 100

B 125% A is Qingkai B's Kaihu 125%.

Twenty percent should be.

Consider the number of A as the unit Huiyin "1". Ruler clear.

The number A is 1, and the number B is 4 5.

1 4 5 5 4 125 before Lingbi

Answer: The number A is 125 of the number B

Let the number of Yitong Tan be x, then the number of A is four-fifths x, then x: (x + four-fifths of the cherry blossom x) x: nine-fifths x five-fifths of the nine ridge chakras.

Answer: Number B is five-ninths of the sum of the two numbers A and B.

1. Take the number B as 1, and the number A is 1 3 5 = 3 and the number B of the car 5 is 1 3 5 = 5 3 of the number of A

2. Take number B as 5 parts, and number A is 3 parts.

The number B is the number of A: 5 3 = 5 3

The finch is not scattered by the number of B, and the age is the number of A (