Suppose you receive an E-Mail file that contains an image that is 25% larger than the original image. By what percent decrease would you need to reduce the image size to return it to its original size?

Question

anonymous · Answer

original size = o, new size = n.

then n = 1.25o and o = n/1.25

anonymous · Answer

$$1/1.25 = 1/\left(\frac{5}{4}\right)=\frac{4}{5}=?\%$$

anonymous · Answer

20% ?

anonymous · Answer

Sorry 80. I got confused.

anonymous · Answer

oops, yeah maybe because of how the question is written.  it would only be a 20% reduction.

anonymous · Answer

1-20% = 80% => 20% reduction, right?

anonymous · Answer

Yeah, because 100% - 80% = 20%

anonymous · Answer

yes, but it's not an 80% reduction because what would remain would be 20% of what was previously there.

in your case, 80% is what's left so it's a 20% reduction.

anonymous · Answer

I see, thank you so much c:

anonymous · Answer

you are welcome!

anonymous · Answer

sorry for initially confusing the question/answer

anonymous · Answer

Oh no don't worry about it, haha xD