1.

The ratio of the present ages of a son and his father is `1:5` and that of his mother and father is `4:5` After 2 years the ratio of the age of the son to that of his mother becomes `3:10`. What is the present age of the father ?A. 30 yearsB. 28 yearsC. 37 yearsD. None of these

Answer» Correct Answer - D
`(S)/(F)=(1)/(5)rArr F=5S`
`(M)/(F)=(4)/(5)rArr M=(4)/(5)F`
`(S+2)/(M+2)=(3)/(10)`
` rArr 10S +20=3M+6=3xx(4)/(5)xx 5S+6=12S+6`
`therefore 2S=14rArr S=7` years
`therefore F=5S=35` years.


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