Original number from percentage of number

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It' been more than 50 yrs since I was in high School, but this problem is bothering me.

If I have a number and I need 85% on that number, it easy. Just multiply the number by .85.

But I need to turn that around. If the the 85% number and I need to get the original number, I cant just multiply by 1.15.

I hope I explained it correctly. Going up is what I cant figure out.

Thanks
 
Rather than multiply by 0.85, divide by 0.85 and you have the original number :)
 
It' been more than 50 yrs since I was in high School, but this problem is bothering me.

If I have a number and I need 85% on that number, it easy. Just multiply the number by .85.

But I need to turn that around. If the the 85% number and I need to get the original number, I cant just multiply by 1.15.

I hope I explained it correctly. Going up is what I cant figure out.

Thanks

Say the number is 100.

Then 85% of 100 = 0.85(100) = 85.

To get the original number back, divide 85 by 0.85.

So, 85 ÷ 0.85 = 100, the original number.

In a general sense, let n = the original number.

Then 0.85n = m, where m is the new number.

To get back the original number n, we do this:

m/0.85 = n, the original number.
 

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