Question

if an angel is 2/5 on its suplement

Answer 1

$let \: the \: angle \: be \: x \\ its \: supplement \: = 180 - x \\ according \: to \: question \\ x = \frac{2}{5} (180 - x) \\ 5x = 360 - 2x \\ 5x + 2x =360 \\ 7x = 360 \\ x = \frac{360}{7} = 51.428$

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