Khan/khan-exercises — Issue #14897: Percentage word problems 1 - The answer in the site is wrong
Author: KhanBugz
Created: 2012-02-29 00:54:00+00:00
State: open
Labels: chrome, wrong-or-unclear

Reporter: cosmoskyle@gmail.com

I was solving the following question:
"92 is 21% of what number? (Round to the hundredths place.)"

According to the site, this is the solution:
"
Let x be the number that 92 is 21% of.

0.21×x=92
x=92/0.21
x≈438.1
"
But, x=92/0.21≈428.571≈428.57.
So, the answer should be 428.57.

I've checked it on a calculator 10 times.

Thank you.

[percentage_word_problems_1.html?seed=80&problem=backward-percentages](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/percentage_word_problems_1.html?seed=80&problem=backward-percentages&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/percentage_word_problems_1.html?seed=80&problem=backward-percentages&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22428.57%5C%22%22%2C14%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22hint-activity%22%2C%220%22%2C14%5D%2C%5B%22hint-activity%22%2C%220%22%2C20%5D%2C%5B%22hint-activity%22%2C%220%22%2C22%5D%5D)

["428.57"]

Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.10 (KHTML, like Gecko) Chrome/17.0.945.0 Safari/535.10

MathJax is loaded, ready, queue length: 0