Find the LCM of \(\frac{4}{5}\) , \(\frac{8}{9}\) , \(\frac{5}{7}\) .

40 \(\frac{8}{36}\) \(\frac{1}{40}\) \(\frac{1}{16}\)

40

L.C.M. of \(\frac{4}{5}\) , \(\frac{8}{9}\) , \(\frac{5}{7}\) = \(\frac{LCM\;of\;(4,\;8,\;5)}{HCF\;of\;(5,\;9,\;7)}\)   {\(\frac{LCM\;of\;numerator}{HCF\;of\;denominator}\)} = \(\frac{40}{1}\) = 40