The difference of two numbers is 4.If the difference of their reciprocals is 4/21, find the numbers

Explanation

Let `a &b` be two numbers


`a-b=4 `
`\frac{1}{b}-\frac{1}{a}=\frac{4}{21}`




`\frac{a-b}{a b}=\frac{4}{21}`


...