Question

I am a greatest 3 digit perfect square number divisible by 10 15 and 20 what is the sum of my digit
option 9 12 13 15

Answer 1

Answer:

9 is the answer

Step-by-step explanation:

The LCM of {10,15,20} is 60

10=2×5

15=3×5

20=2^2×5

hence LCM is 2^2×3×5=60

The perfect square must be exactly divisible by 60

greatest 3digit number is 999 but it is not perfect square..

31^2=961

30^2=900

but 961 is not divisible by 60

hence only 900 is possible which is divisible by 60

hence sum of digits of 900 is 9+0+0=9

Answer 2

Answer:

the option is not correct and the answer is 60