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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-4

  • question_answer
    3 years ago the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is

    A)  1 year                        

    B)  \[1{\scriptstyle{}^{1}/{}_{2}}\]years        

    C)          2 years            

    D)         3 years

    Correct Answer: C

    Solution :

    Let total age of family be S years 3 years ago, total age \[=S-3\times 5=S-15\]             \[\frac{S-15}{5}=17\] \[S=17\times 5+15=100\] Let present age of baby be x years \[\frac{S+x}{6}=17\] \[100+x=17\times 6\] \[x=102-100=2\]years


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