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Powers and Roots Practice Test 2
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© examsnet.com
Question : 2
Total: 40
Find the smallest number which is divisible by 12, 15, 20 and is a perfect square.
400
180
900
1,000
Validate
Solution:
LCM of 12, 15 and 20
To make the LCM a perfect square, we multiply it with 3 and 5
=
2
×
2
×
3
×
3
×
5
×
5
=
900
Perfect square of 30 is 900.
© examsnet.com
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