Question

$80 + \frac{x}{100} \times 80 \: = \: 100$
pls solve this equation ​

Answer 1

➠ $\LARGE\textsf{\textcolor{red}{SOLUTION :-}}$

$\therefore80 + \frac{x}{100} \times 80= 100 \\ \\ \therefore80 + \frac{x}{100} = \cancel \frac{100}{80} \\ \\ \therefore80 + \frac{x}{100} = \cancel \frac{10}{8} \\ \\ \therefore80 + \frac{x}{100} = \frac{5}{4} \\ \\\therefore \frac{x}{100} = \frac{5}{4} - 80 \\ \\ \therefore \frac{x}{100} = \frac{5 - 80 \times 4}{4} \\ \\ \therefore \frac{x}{100} = \frac{5 - 320}{4} \\ \\ \therefore \frac{x}{100} = \frac{ - 315}{4} \\ \\ \therefore x = \frac{ - 315}{4} \times 100 \\ \\ \therefore x = - 315 \times 25 \\ \\\therefore\colorbox{silver}{ x = - 7875}$