> Solution Let the two natural numbers be x and y such that x > y Given: Difference between the natural numbers = 5 ⇒ x - y = 5 ------ (i) Difference of their reciprocals = 110 ⇒ 1y−1x=110 ⇒x−yxy=110 ⇒5xy=110 ⇒ xy = 50 ------ (ii) Putting the value of x from equation (i) in equation (ii), we get (y+5)y=50 ⇒ y2+5y−50=0 ⇒ y2+10y−5y−50=0 ⇒ y(y+10)–5(y+10)=0 ⇒ (y−5)(y+10)=0 ⇒ y = 5 or -10 As y is a natural number, therefore y = 5 Other natural number = y + 5 = 5 + 5 = 10 Thus, the two natural numbers are 5 and 10. NCERT Previous Years Papers Suggest Corrections 14 |