If the sum of two numbers is 55 and the H.C.F. and L.C.M. of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is:

व्युत्क्रमों का योग $= (1/x + 1/y) = (x+y) / (xy)$। हम जानते हैं कि $xy = HCF imes LCM = 5 imes 120 = 600$। इसलिए, $55 / 600 = 11 / 120$।