The average age of four members of a family
is 20 years. If the age of grandmother be
included, the average age increases by 10.
Find out the age of the grandmother.
(a) 70 years
(b) 80 years
(c) 75 years
(d) 85 years
Answers
Answered by
1
Answer:
70
Step-by-step explanation:
if you multiply average age with number of family members, you get total age, which is 80 in this case. Adding 70 will make that 150 and if you divide that by 5, you get 30, which is ten years greater than the initial average. so answer is 70
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