Question

a number when decreased by 20% gives 80. find the number​

Answer 1

ANSWER=100

Let the number be x

x-20%=80

$x - \frac{20x}{100} = 80 \\ \frac{100x - 20x}{100} = 80 \\ \frac{80x}{100} = 80 \\ using \: cross \: multiply \\ 80x = 80 \times 100 \\ 80x = 8000 \\ x = \frac{8000}{80} \\ x = 100$

Hence, the number is 100

Answer 2

Given:

Given an statement a number when decreased by 20% gives 80.

To FInd:

Find the number?

Step-by-step explanation:

• Let the number be x.

        Now 20% of x can by calculated as

                   $20\%x=\frac{20}{100} x=\frac{x}{5}$

• Now we write that statement as

                   [tex]x-\frac{x}{5} =80\\ \frac{4x}{5} =80\\ 4x=80\times5\\ x=100[/tex]

Hence, the number is 100.