5^21 x 4^11 = 2 x 10^n
x means times
I spent over 5 minutes trying to figure this question out during a practice without luck. I am sure there is a trick to it. Comments on how to solve are greatly appreciated.
"N" seems to the only variable in the equation. We could re-write the above as following
[quote="Europe2011"]5^21 x 2^22 = 2 x 5^n x 2^n
N is equal to 21
In the question "x means times" is to clarify that X is the multiplication symbol and not the variable X.