Working out Percentage?

Question

i have a number which has been deducted by 20%, how do i find the original number.

Answer 1

Divide by 100 then multiply by 120

Answer 2

Divide the number by 4 then add it to the number.

Ex.

the number is 8

8/4=2

8+2=10

10*.2=2

10-2=8

which was the number

Answer 3

divide that number by 80 and times by 100.  

Answer 4

Add 20% on to the number you have.

Answer 5

Divide by 0.8

Answer 6

If you call the original number X

Then reducing by 20% is

x - 0.2x which simplifies to

(1 - 0.2)x

So If you wish to find out original number (x) take the reduced number (y) and divide it by (1 - 0.2), which is 0.8.

(1-0.2)x = y,

x = y / (1-0.2)