http://www.ryot.org/math-question-is-stumping-the-internet/934258
Now, there is a new math problem sweeping the Internet. The question, according to Mashable, appeared on the GCSE exam in the UK, which is taken by students in secondary schools. An estimated 500,000 took the test. The question is so confusing that over 5,000 people have signed a petition to allow students to re-sit for the entire exam.
Think you can solve it? Here’s the question:
There are n sweets in a bag. Six of the sweets are orange. The rest of the sweets are yellow. Hannah takes a random sweet from the bag. She eats the sweet. Hannah then takes at random another sweet from the bag. She eats the sweet. The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0.