Question

If ξ = {1,2,3,4,5,6,7,8,9 }, A={1,2,3,4,6,7,8}, B={ 4,6,8} Then find (A∩B)​

Answer 1

Answer:

Two numbers are such that the ratio between them is 3:5.If each is increased by 10 ,the ratio between the new numbers so formed is 5:7

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ToFind:−

Original number

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Solution:−

Let the number be 3x and 5x

According to the given condition

Each number is increased by 10 ,the ratio between the new numbers so formed is 5:7

3x + 10/5x + 10 = 5/7

7(3x + 10) = 5(5x + 10)

21x + 70 = 25x + 50

21x - 25x = 50 - 70

- 4x = - 20

x = 20/4 = 5

Hence,

Required numbers

First number = 3x = 15

Second number = 5x = 25

So by forming two numbers that is given above will be 25.

Answer 2

Answer:

{4,6,8}

Step-by-step explanation:

we will take out shai is common between the two sets A and B and write it.

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