1.

The ratio of ages of Krishna and Balram is 3:4. Four years earlier the ratio was 5:7. Find the present ages of Krshna and Balram:

Answer»

Solution :LET the PRESENT age of Krishna and BALRAM be 3X and 4x Four years AGO their ages be (3x-4) and (4x-4) S0, `(3x-4)/(4x-4)=5/7 implies 7(3x-4)=5(4x-4)`
`implies 21x-28=20x-20`
`implies ` x=8
therefore present age of Krishna =3x=24 years and age of Balram=4x=32 years


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