Grandma

Grandma is 57 years older than her two twin granddaughters. If we add the ages of an older woman with both granddaughters, we get the number 99. How old is her old woman?

Correct answer:

s =  71

Step-by-step explanation:

s=57+a s+a+a=99  as=57 2a+s=99  Pivot:Row1Row2 2a+s=99 as=57  Row221 Row1Row2 2a+s=99 1.5s=106.5  s=1.5106.5=71 a=299s=29971=14  a=14 s=71



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