Question

14. The average age of 4 siblings is 12.5 years. If 3 of the siblings are 12-year-old triplets, how old is the fourth sibling? (A) 11.5 (B) 13 (C) 13.5 (D) 14 ​

Answer 1

B

Explanation:

12.5x3=37.5

37.5 +11.5 =49

49÷4 =12.25

Answer 2

D) 14

Explanation:

12+12+12 is 36 we don't know hold old the fourth sibling is so they are X

to get the average of 12.5 you need to add all the siblings ages then divide it by 4

(36+X)/4=14 so the other sibling is 14