Question

if twice a number is added to 5 by 7 we get 7 by 3 find the number​

Answer 1

Let the required number be x.

Then,

$2x + \frac{5}{7} = \frac{7}{3} \\ \\ \: \: \: \: \: \: \: \: 2x = \frac{7}{3} - \frac{5}{7} \\ \\ \: \: \: \: \: \: \: \: 2x = \frac{49 - 15}{21} \\ \\ \: \: \: \: \: \: \: \: 2x = \frac{34}{21} \\ \\ \: \: \: \: \: \: \: \: \: \: x = \frac{ \frac{34}{21} }{2} = { \red{\frac{17}{21} }}$