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Addition of Rational Expressions

Find the miss...

Question

Find the missing character in the following question.

7 9 21 27
4 2 36 18
9 4 54 ?

A

18

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B

24

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C

36

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D

48

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E

58

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Solution

The correct option is B 24
$I n t h e f i r s t r o w : \frac{21}{7} = \frac{27}{9} I n t h e s e c o n d r o w : \frac{36}{4} = \frac{18}{2} ∴ I n t h e t h i r d r o w : \frac{54}{9} = \frac{x}{4} \Rightarrow x = 24$

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