Question

What is the value for x in the proportion x/x-12 = 9/5

Answer 1

x=27

Answer 2

\(\Large \color{purple}{\rightarrow {x \over x - 12} = {9 \over 5} }\)

\(\Large \color{purple}{\rightarrow 5x = 9(x - 12) }\)

\(\Large \color{purple}{\rightarrow 5x = 9x - 108 }\)

\(\Large \color{purple}{\rightarrow 108 = 9x - 5x }\)

\(\Large \color{purple}{\rightarrow 4x = 108 }\)

\(\Large \color{purple}{\rightarrow x = {108 \over 4} = 27 }\)

Answer 3

@vamgadu straight-away answering is not allowed on this site.

Answer 4

If two fractions are equal, then their cross multiplications are equal.