What is the reciprocal ratio of $(x + 12) : (x + 21)$ ?

(x + 21) : (x + 12)

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(x + 24) : (x + 42)

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(x + 6) : (x + 10)

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(x + 42) : (x + 24)

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Solution

The correct option is C $(x + 21) : (x + 12)$
The reciprocal ratio of $a : b$ is $b : a$
$∴$ reciprocal ratio of $(x + 12) : (x + 21)$ is $(x + 21) : (x + 12)$

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