If a : b = c :d, prove that :
(i) 5a + 7b : 5a - 7b = 5c + 7d : 50 - 7d.
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Answer:
Given
a/b=c/d
5a/7b=5c/7d (multiplying each side by 5/7)
5a+7b/5a-7b=5c+7d/5c-7d( by componendo and dividiendo)
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