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The ratio of present age of a father and his son is 7:2. after 5 year the age of son will be 37% of that of his father .The present age of the father is.

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therefore sons present age = 2x/7

after 5yrs

fathers age = x+5

sons age = 2x/7 +5

now sons age = 37% of fathers

=> 2x/7 + 5 = (x+5)37/100

=>(2x+ 35)/7 = (37x + 185)/100

=>100(2x+35) = 7(37x+185)

=>200x +3500 = 259x + 1295

=> 59x = 2205

=> x= 37.37 yrs

x/y = 7/2 , 2x = 7y , y = 2x/7

(y+5) = 37/100 * (x+5)

(2x/7 + 5) = 37/100 * (x+5)

(2x + 35) / 7 = (37x + 185) / 100

200x + 3500 = 259x + 1295

259x - 250x = 3500-1295

59x = 2205

x = 37.37 years