InterviewSolution
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If a ∶ b = 2 ∶ 3, b ∶ c = 4 ∶ 5 and c ∶ d = 6 ∶ 7, then a ∶ d = ?1). 12 ∶ 352). 24 ∶ 353). 16 ∶ 354). 24 ∶ 25 |
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Answer» a : B = 2 : 3 ⇒ a/b = 2/3 ⇒ b = 3a/2 b : c = 4 : 5 ⇒ b/c = 4/5 $(\RIGHTARROW \frac{{3a}}{2}\;:c = 4\;:5\;)$ ⇒ c = 15A/8 c : d = 6 : 7 ⇒c/d = 6/7 $(\Rightarrow \frac{{\frac{{15a}}{8}}}{d} = \frac{6}{7})$ $(\Rightarrow \frac{a}{d} = \frac{8}{{15}} \TIMES \frac{6}{7})$ ⇒ a/d = 16/35 ⇒ a : d = 16 : 35 |
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