Question

Decreasing a number by 18% it become 697

Answer 1

First you need to find how much percentage is 697
Your question says the original number is decreased by 18% and gives you 697, that means 697 is 100 - 18 = 82%
697 is 82% of your original number
When you have the percentage, the number of that percentage, and you want to find the original number, you have to take the number you have and divide it by the percentage
697\(82*100)=697*100/82=+850