Aptitude - Square Root and Cube Root - Discussion

VERY SIMPLE R80+6R5=4R5+6R5=10R5=10*2.235=22.35

Hello zee.

You are right. But we know R5 value. For higher root values above explanation process is must.

I don't know how to find roots for long numbers like 34567 can you please tell me that.

Please tell me what is the meaning of 3 root 5? Is it 125, means cube of 5. I am little confused.

Make square of 3R5 square of 3 = 9 & square of R5 = R5*R5 = 5.

This is the answer and meaning of 3R5.

I am not understanding what you have solved explain it again briefly?

For better result you can consider it as follow:

The square root of 81 = 9*9 = 9.

So, the square root of 80 should be less then 9 lets guess it as 8.80.

Same way the square root of 4 = 2*2.

We can guest square root of 5 should be greater then 2 lets say it is 2.25.

Now 8.80+6*2.25 = 8.80+13.50 = 22.30.

Choose the nearest answer from our answer which is 22.35.

So answer = 22.35.

This is not accurate method this can be only use when you have very less time.

How is 17.88 turn into 2.235 what 8 did here?

Can anyone explain me the third step of explanation?

How you can eliminate 8 in 8r5?