The ratio of the present ages of Suman and Renu is 5 : 7
respectively. Four years hence the ratio will become 3 : 4
respectively. What is the present age of Renu in years?
(a) 28
(b) 24
(c) 20
(d) 21
(e) None of these
let the ratio of ages of suman and renu be 5x/7x
after four years
their ratio of ages is (5x+4)/(7x+4)=3/7
on solving the equation 20x+16=21x+12
we get x=4
on substitution in 7x
we get renu’s present age as
28 years
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let the ratio of ages of suman and renu be 5x/7x
after four years
their ratio of ages is (5x+4)/(7x+4)=3/7
on solving the equation 20x+16=21x+12
we get x=4
on substitution in 7x
we get renu’s present age as
28 years
( a ) 28