Question

The average of two numbers a and b is given by
A = a +b/2

If the average of two numbers is 75, and if one of the numbers is 91, the what is the other number?

Answer 1

\(\Large \color{purple}{\rightarrow {(91 + x) \over 2} = 75 }\)
\(\Large \color{purple}{\rightarrow 91 + x = 150 }\)
\(\Large \color{purple}{\rightarrow x = 150 - 91 = 59 }\)