The present age of father and son is 7:2. after 5 yrs the age of son is 37% the age of his father. what is the present age of father

Let present ages of father be x and of son is y years

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