Answer:
9 years old
Step-by-step explanation:
the average age of 3 people is 27
x / 3 = 27.....x = 27 * 3.....x = 81......this means that the total of their ages is 81.
their ages are in the proportion of 1:3:5....added = 9
this means that the first person is 1/9 of the total ages..
the second person is 3/9 of the total ages
the third person is 5/9 of the total ages
person 1 : 1/9 of 81 = 81/9 = 9 years old <==== this is the youngest
person 2 : 3/9 of 81 = 243/9 = 27 years old
person 3 : 5/9 of 81 = 405/9 = 45 years old