1 is the remainder. You misunderstood this one, TQ!
I agree with HSC. There are many out there.
Go here: http://www.businessinsider.com/if-you-can-solve-these-math-problems-you-are-as-smart-as-the-worlds-smartest-teenagers-2013-5?op=1
Google World's Hardest Math Problems.
Pi is infinite. We cannot uncover the full value of pi. We have only revealed a fraction of it.
Good job! +5 stars for you!
God job Guest!
45/20=18/p → p=8
Divide 21 by 4
21/4 = 5.25
9x-7=-7 ⇒ x=0