To find out what number 40 is 50 percent of, you can use the following formula:
Number = (Part / Percent) * 100
Here, the Part is 40, and the Percent is 50.
Plugging in the values:
Number = (40 / 50) * 100
Number = 0.8 * 100
Number = 80
So, 40 is 50 percent of 80.