(a) Let least even number = x Consecutive even numbers ⇒x,x+2,x+4,x+6 Let least odd number = y Consecutive odd numbers =y,y+2,y+4 According to question, [x+(x+2)+(x+4)+(x+6)]–[y+(y+2)+(y+4)]=81 4x+12–3y–6=81 4x–3y=75...(i) Now, sum of smallest even and odd numbers x+y=59...(ii) Solving (i) and (ii)x = 36, y = 23 Now sum of largest even number and largest odd number ⇒(36+6)+(23+4)=69