How to find the percent when they already give you the answer. for example: _% of 40=15 what would the answer be and how do you find it out

So the question is what percent of 40 is 15
Let's write proportion
100%-40
X% - 15
X=15·100:40=1500:40=37,5%

37,5% of 40 is 15.

The first one is correct

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.