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The ratio of two numbers is 4 : 5. But, if each number is increased by 20, the ratio becomes 6 : 7. The sum of such...
Solution
Let, a : b = 4 : 5Then a = 4k; b = 5k (where k is a common multiple)Then (a + 20) : ( b + 20) = 6 : 7(4k + 20) : (5k +...
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Keynote
If A : BÂ = C : Dthen, we can writeA = Ck; B = Dk where k is some common multiple.
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