Question

a number decreased by 20percent gives 80.find the number​

Answer 1

$\huge{\mathcal{\blue{\underline{Answer}}}}$

Let the number be x

$x - \frac{20}{100} =80 \\ \frac{100x - 20}{100} = 80 \\ 100x - 20 = 18000 \\ 100x = 18000 - 20 \\ 100x = 17980 \\ x = \frac{17980}{100} \\ x = 179.80$