Grandfather

The grandfather is three years older than the grandmother. The average age of the grandmother, the grandfather, and their seven grandchildren is 28. The grandchildren have a total of 105 years. Calculate how old grandfather is.

Correct answer:

o =  75

Step-by-step explanation:

o = m + 3 (m+o+7 v)/(1+1+7) = 28  v=105/7=15  (m+o+7 v)/(1+1+7) = 28 m+o+7 v = 28 (1+1+7)  (o3)+o+7 v=28 (1+1+7) (o3)+o+7 15=28 (1+1+7)  2o=150  o=2150=75  o=75   Verifying Solution:  m=o3=753=72 p=1+1+7o+m+7 v=1+1+775+72+7 15=28



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