Grandchildren 80639

The average age of the grandfather, grandmother, and their five grandchildren is 26 years. The average age of the grandchildren themselves is 7 years. Grandma is a year younger than grandpa. How old is grandma?

Correct answer:

x =  73

Step-by-step explanation:

2+57 5 + (x+1) + x = 26  7 5+(x+1)+x=26 (2+5)  2x=146  x=2146=73  x=73   Verifying Solution:  d=x+1=73+1=74  a=2+5d+x+5 7=2+574+73+5 7=26

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