Question

the age of Mohan and Sohan are in the ratio 5 :7 is if Mohan was 9 year older and Sohan 9 years younger than their age would be in the ratio 2 : 1 find their present age

Answer 1

let present age of Mohan and Sohan be 5x and 7x respectively. according to question,
$5x + 9 \div 7x - 9 = 2 \div 1$
solving we get X is equals to 3.
then the present ages of Mohan and Sohan will be 15 and 21 respectively.