To find the number when one fifth of it equals 9, we first represent the unknown number as x. According to the problem, we can set up the equation:
8 = 9
To find x, we will multiply both sides of the equation by 5, since we want to isolate x.
x = 9 7; 5
When we do the multiplication:
x = 45
So, the number we are looking for is 45. To verify, we can check if one fifth of 45 equals 9:
(1/5) * 45 = 9
This confirms that our solution is correct.