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Mathematics

If 2p = 3q = 4r then p : q : r is equal to:

  1. 2 : 3 : 4

  2. 3 : 4 : 6

  3. 4 : 3 : 2

  4. 6 : 4 : 3

Ratio Proportion

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Answer

Let, 2p = 3q = 4r = k

p = k2\dfrac{k}{2}

q = k3\dfrac{k}{3}

r = k4\dfrac{k}{4}

p:q:r=k2:k3:k4=k2×12:k3×12:k4×12=6k:4k:3k=6:4:3.\Rightarrow p : q : r = \dfrac{k}{2}:\dfrac{k}{3}:\dfrac{k}{4} \\[1em] = \dfrac{k}{2} \times 12 : \dfrac{k}{3} \times 12 : \dfrac{k}{4} \times 12 \\[1em] = 6k : 4k : 3k \\[1em] = 6 : 4 : 3.

Hence, option 4 is the correct option.

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