Question
If a: b = 5: 3, then (a³-b³): (a³+b³) = ?
The correct answer is
49:76
Given a:b = 5:3 Let a = 5k and b = 3k (a³ - b³) : (a³ + b³) = (125k³ - 27k³) : (125k³ + 27k³) = 98k³ : 152k³ = 49 : 76
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Important Questions from Compound Ratios
- What is the compound ratio of $45 : 75$, $3 : 5$, $51 : 68$ and $256 : 81$?
If A : B = 2 : 5, B : C = 4 : 3 and C : D = 2 : 1, then what is value of A : C : D?
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\(a : b = 2 : 3\)
\(b : c = 4 : 5\)
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\(d : e = 5 : 4\)
What is the value of the ratio a : e?
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