Answer:
20
Explanation:
So we first subtract 25% from 100% so we can see what percent 15 is:
100 - 25 = 75 so 15 is 75% of ___:
This gives us a standard percentage problem, so:
75% = 0.75
we can rewrite the equation as a one-step equation:
15 = 0.75a
Dividing both sides by 0.75 and swapping sides gives
a = 15 ÷ 0.75 = 20
So the original price of the hat was $20
OR
because 25% is 1/4, and 75% is 3/4 and 15 is therefore 3/4:
15 ÷ 3 = 5
5 x 4 = 20