If a : b : : c : d, prove that (i) (2a+5b) /(2a−5b)=(2c+5d)/(2c−5d) (ii)( 5a+11b)/(5c+11d) =(5a−11b) /(5c−11d) (iii) (2a + 3b)(2c – 3d) = (2a – 3b)(2c + 3d) (iv) (la + mb) : (lc + mb) :: (la – mb) : (lc – mb)

exam oriented an important question from ML aggarwal, class 10th, chapter 7, ratio and proportion, Avichal publication

Here we have been given that a:b::c:d and we have to apply mathematical operations to prove given equalities.

Question no 1, exercise 7.3

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