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nilankshi
five year hence,the age of jacob will be three times that of his son.five years ago.jacob's age was seven times that of his son.what is thair present age?
why did u post this in the history section? :o
Anyways, in 5 years, jacob's age = J+5 in 5 years, his son's age = S+5 but Jacob will be 3 times older than his son, therefore J+5=3(S+5) J+5=3S+15 J=3S+10 --------------(equation 1) 5 years ago, jacob's age = J-5 5 years ago, his son's age = S-5 but Jacob was 7 times older than his son, therefore J-5=7(S-5) J-5=7S-35 J=7S-30 --------------(equation 2) this means that 7S-30=3S+10 7S-3S=10+30 4S=40 S=10 this means that from equation 2, J=7S-30 J=7(10)-30 J=70-30 J=40 Hence their present ages are 70 and 10 :) if you're not clear about anything, do let me know :)