Question 31

Select the option that is related to the third number in the same way as the second number is related to the first number.
225 : 210 :: 324 : ?

Solution

$$225-\sqrt{\ 225}\ =\ 225-15 = 210$$

$$324-\sqrt{\ 324}=324-18=306$$

Hence 306 will come in place of question mark.

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