1.

One year ago, the ratio of Gaurav’s and Sachin’s age was 6: 7 respectively. Four years hence, this ratio would become 7: 8. How old is Sachin ?

Answer»

Let Gaurav's and Sachin's ages one year ago be 6x and 7x years respectively. 

Then, Gaurav's age 4 years hence = (6x + 1) + 4 = (6x + 5) years. 

Sachin's age 4 years hence = (7x + 1) + 4 = (7x + 5) years.

6x+5/7x+5 = 7/8 

8(6x+5) = 7 (7x + 5) 

48x + 40 = 49x + 35 

x = 5. 

Hence, Sachin's present age = (7x + 1) = 36 years.



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