Question 140

What number will replace the question mark?

Solution

In the patter we observe $$\ \frac{product\ of\ number\ in\ traigle\ }{product\ of\ number\ in\ sqaure\ and\ circle}\ =\ \ \frac{\ 6\times\ 8}{12\times\ 8}=\ \frac{\ 5\times\ 6}{6\times\ 10}=\ \frac{\ 1}{2}$$

Let the missing number be $$N$$

$$\ \frac{\ 3\times\ 12}{4\times\ N}=\ \frac{\ 1}{2}$$

$$N=18$$

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What number will replace the question mark?

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