Question 73

Find the value of k if 5 : k :: 30 : 42.

Solution

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$$5:K::30:42$$

$$\frac{5}{K}=\frac{30}{42}$$

$$30K=42\times\ 5$$

$$30K=210$$

$$K=\frac{210}{30}$$

$$K=7$$

Hence option B is the correct answer

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