Question

900:841::400:___
complete this number analogy

Answer 1

Hey friend here is your answer

900 is square of 30.

And 841 is square of 29

So, as 400 is square of 20

we need to find square of 19 i.e. 361.

So the answer is 361.

Hope it helps you.

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Answer 2

to know this you should be perfect with 30squares

900=30^2.

841=29^2. that means the difference
between their squares is 1

400=20^2
now the difference should be 1 means 19^2

that is 361