Let the total number of people surveyed by y. we can solve this by using algebra.
to find the percentage of a number in terms of decimals or integers, just multiply the total by the percentage, so with this question, y x 40% = 20 shift x40% to the other side and turn it into /40% y = 20 / 40% change the percentage into decimals for easier calculations, y = 20 / 0.4 y = 50
