Jerry was 1/3 as young as his grandfather 15 years ago. If the sum of their ages is 110, how old is Jerry's grandfather?

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Answer 1 · 2017-04-26T17:29:03

75 years

Let grandfather's age was x years 15 years ago. So Jerry's age was #x/3# years 15 years ago.

Hence 15 years ago sum of their's age was 110 - 15*2 = 80 years.

So as per questions, #x + x/3 = 80#

#rArr [3x+x]/3 = 80#

#rArr (4x)/3 = 80#

#rArr x = 80xx3/4 = 60#

Therefore 15 years ago grandfather's age was 60 years.

Now grandfather's age is 60 + 15 = 75 years.