Question

The ages of Rahul and Ravi are in the ratio 5:7. Four years later the sum of their ages will be 56 years. What is the present age of Ravi in years? (1).14 (2).21 (3).28 (4).35

Answer 1

your answer is 28.
here is explanation...

after 4 year
5 x + 7 x + 4 + 4= 56
12x+8=56
12x=56-8= 48
x= 48/12=4
then age f Rahul= 5×4=20
age of Ravi =7×4=28

Answer 2

solution:

here ratio of there ages given= 5:7

Let present age of Rahul= x and Ravi= y

ATQ, X/Y= 5:7

=> 5y= 7x

=> x= 5y/7

Now, according to second condition,

=>(x+4)+(y+4)= 56

=> (5y/7+4)+(y+4)=56

=> (5y+ 28+ 7y+28)/7= 56

=> 12y+56= 56*7

=> 12y+56= 392

=> 12y = 336

=> y= 28

so,we have taken y as a Ravi age so ravi is 28 years old

And,option C is correct.

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Hope it help you my friend☺☺☺