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Let the present age of x and y be 3x and 7x. According to the question 3x+7/ 7x+7= 11/21 ⇒21(3x+7)= 11(7x + 7) ⇒63x+147= 77x+77 ⇒63x-77x= 77-147 ⇒-14x= -70 ⇒x=70/14 Thus,x=5 Hence, present age of x = 3x= 3*5=15 and present age of y= 7x= 7*5= 35