# Aptitude - Square Root and Cube Root - Discussion

### Discussion :: Square Root and Cube Root - General Questions (Q.No.5)

5.

If 35 + 125 = 17.88, then what will be the value of 80 + 65 ?

 [A]. 13.41 [B]. 20.46 [C]. 21.66 [D]. 22.35

Explanation:

35 + 125 = 17.88 35 + 25 x 5 = 17.88 35 + 55 = 17.88 85 = 17.88 5 = 2.235 80 + 65 = 16 x 5 + 65

= 45 + 65

= 105 = (10 x 2.235) = 22.35

 Zee said: (Jun 12, 2011) VERY SIMPLE R80+6R5=4R5+6R5=10R5=10*2.235=22.35

 M.V.Krishna/Palvoncha said: (Sep 11, 2011) Hello zee. You are right. But we know R5 value. For higher root values above explanation process is must.

 Sivajyothi said: (Apr 18, 2012) I don't know how to find roots for long numbers like 34567 can you please tell me that.

 Nidhi Dahiya said: (Dec 15, 2014) Please tell me what is the meaning of 3 root 5? Is it 125, means cube of 5. I am little confused.

 Poornamsh said: (Dec 18, 2014) Make square of 3R5 square of 3 = 9 & square of R5 = R5*R5 = 5. This is the answer and meaning of 3R5.

 Manoj Kumar said: (Dec 25, 2014) I am not understanding what you have solved explain it again briefly?

 Amit said: (Feb 20, 2015) 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.

 Khushb said: (May 24, 2015) How is 17.88 turn into 2.235 what 8 did here?

 Vikas said: (Jun 14, 2015) Can anyone explain me the third step of explanation?

 Mozzima said: (Jul 6, 2015) How you can eliminate 8 in 8r5?

 Nanalal said: (Oct 3, 2015) Sir How to solve these questions? R5456*R2120/R460.

 Abhijit said: (Nov 20, 2015) How to calculate value of R5 manually?

 Sukanto Karmakar said: (Dec 27, 2015) I want to know how to calculate value of R5 manually?

 Taj said: (Feb 12, 2016) How to calculates R5 in short cut method?

 Gargi Sarma said: (May 10, 2016) I don't understand this sum clearly. Can anyone help me to understand this?

 Uma Mahesh said: (May 20, 2016) Could you please explain this problem clearly?

 Mahi said: (Jul 8, 2016) Anyone please explain R5. I was more confused in that.

 Divya said: (Oct 11, 2016) We have to divide 17.88 by 8, so root 5 = 2.235.

 Viju said: (Dec 26, 2016) Can you please explain in simple method Hw it come 2.235?

 Ashwini said: (Nov 11, 2017) Here you divide 17.88 by 8 then why you multiplied 2.235 by 10?

 Sangay said: (Jul 23, 2018) If 35 + 125 = 17.88, then what will be the value of 80 + 65? Please explain.

 Wrick said: (Nov 12, 2018) Easiest way is; 8√5=1788/100. => (10/8)*8√5 = (1788/100) * (10/8) = 223.5/10 = 22.35.

 Honnu said: (Jun 6, 2019) Please anyone explain, How to calculate √5 value?