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Estimating the Square Root

Rick says the...

Question

Rick says the number in yellow boxes can be formed by multiplying the number in purple boxes by 3. Find the number in the last yellow box.

A

18

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B

21

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C

27

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D

24

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Solution

The correct option is B 21
Number in yellow box
= Number in purple box x 3
So, number in the last yellow box will be;
$7 \times 3 i . e . 21$

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