Question

Q. The product of 2 rational numbers is -3/7. If one of the number is 5/21, find the other one. ​

Answer 1

Required Answer :

Other number = - 9/5

Given :

• Product of two rational numbers = - 3/7
• One of the number = 5/21

To find :

• The other number

Solution :

Let,

• The other number = a

According to the question,

⇒ First number × Second number = 5/21

⇒ 5/21 × a = - 3/7

⇒ a = - 3/7 × 21/5

⇒ a = - 3 × 3/5

⇒ a = - 9/5

The value of a = - 9/5

Substituting the value of a :

Other number :

⇒ Other number = a

⇒ Other number = - 9/5

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Let's verify :

We can verify the value of other number by multiplying the first and second number, if the product will be equal to 5/21 (as mentioned in the question) then the value of other number is right.

⇒ 5/21 × - 9/5

⇒ - 9/21

⇒ - 3/7

Hence, verified!