So,
There are two (or more) ways to solve this.
#1: We can notice the pattern as the numerator goes up by 1 each time.
Every time the numerator goes up by 1, the result goes up by 2. Since the previous item was worth 8, and since the number we are trying to find is obviously the next item in the series, we can just add 2 again to get 8 + 2 = 10. So 10 is your answer.
#2: We can recognize that 5/5 is equal to 1.
Since 5/5 is equal to 1, and anything multiplied by 1 remains the same, we can say that 1 * 10 = 10. So 10 is still your answer, without so much brain-work.
