Question 935126
x = Kim's age 
x + 30 = Kim's father's age {Kim's father is 30 years older than Kim}
x + 55 = Kim's grandfather's age {Kim's grandfather is 25 years older than Kim's father}


Kim was born in 2002, so she is currently 12 if she has already had her birthday in 2014}


x = 12 {Kim's age}
x + 55 = Kim's grandfather's age
= 12 + 55   {substituted 12, in for x, into x + 55}
= 67   {added}


Kim's grandfather is 67
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