Question

The product of two rational numbers is 3/8. If one of the number is 2/5 , find the other number.

Answer 1

if i subtract 3/8 with 2/5 i get 1/40

Explanation:

i dont know if this is correct but it seems so

Answer 2

Explanation:

—Let the unknown number is x, so we can write the equation like below.

`(2)/(5) * x = (3)/(8)`

`\:`

—Find x.

`(2)/(5) * x = (3)/(8)`

`x = (3)/(8) / (2)/(5)`

`x = (3)/(8) * (5)/(2)`

`x = (15)/(16)`

`\:`

—Let's prove that it's true.

`(2)/(5) * x = (3)/(8)`

`(2)/(5) * (15)/(16) = (3)/(8)`

`(30)/(80) = (3)/(8)`

`(30 / 10)/(80 / 10) = (3)/(8)`

`(3)/(8) = (3)/(8) \: \: \text{proved}`

`\:`

So, the other number or the value of x is
`(15)/(16)`