Calculate: (x)/(10)=(40)/(50)

Expression: $\frac{ x }{ 10 }=\frac{ 40 }{ 50 }$

Cancel out the common factor $10$

$\frac{ x }{ 10 }=\frac{ 4 }{ 5 }$

Simplify the equation using cross-multiplication

$5x=40$

Divide both sides of the equation by $5$

$x=8$