31. Admission to a carnival is $4 for children and $6 for adults. A group of 21 people pays $90 for admission to the carnival. What is the ratio of the number of children to the number of adults in this group?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

Assuming that the number of children is x and the number of adults is y, set up a system of equations: x+y=21, 4x+6y=90, find x=18, y=3, x:y=6:1 , so choose C