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A Perfect Square Always Ends in 0,1,4,5,6,9 as Last Digit

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Question

Find a number that is divisible by 15, 18, and 25 and is a perfect square

A

225

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B

450

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C

400

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D

900

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Solution

The correct option is B 900
L.C.M of 15, 18 and 25 is 450 but it is not perfect square .
But 900 is the perfect square and divisible by 15, 18 and 25
$900 \div 15 = 60$
$900 \div 18 = 50$
$900 \div 25 = 36$
$\sqrt{900} = 30$

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