How can I determine the base of the following numbers for the operations to be correct? Given:
$24_A + 17_A = 40_A$
How can I find the base of the following number $A$ so the operations are correct?

Hint to get you started: By definition, in base b, the first digit from the right is representative of the $b^0$ place, the second from the right is $b^1$'s, just like in base 10 the number 12 is $2 * 10^0 + 1* 10^1$  
