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 ?
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| [A]. |
13.41 | | [B]. |
20.46 | | [C]. |
21.66 | | [D]. |
22.35 |
Answer: Option D
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
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Zee said:
(Jun 12, 2011)
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| VERY SIMPLE R80+6R5=4R5+6R5=10R5=10*2.235=22.35 |
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M.V.Krishna/Palvoncha said:
(Sep 11, 2011)
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Hello zee.
You are right. But we know R5 value. For higher root values above explanation process is must. |
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Sivajyothi said:
(Apr 18, 2012)
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| I don't know how to find roots for long numbers like 34567 can you please tell me that. |
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Nidhi Dahiya said:
(Dec 15, 2014)
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| Please tell me what is the meaning of 3 root 5? Is it 125, means cube of 5. I am little confused. |
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Poornamsh said:
(Dec 18, 2014)
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Make square of 3R5 square of 3 = 9 & square of R5 = R5*R5 = 5.
This is the answer and meaning of 3R5. |
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Manoj Kumar said:
(Dec 25, 2014)
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| I am not understanding what you have solved explain it again briefly? |
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Amit said:
(Feb 20, 2015)
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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. |
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Khushb said:
(May 24, 2015)
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| How is 17.88 turn into 2.235 what 8 did here? |
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Vikas said:
(Jun 14, 2015)
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| Can anyone explain me the third step of explanation? |
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Mozzima said:
(Jul 6, 2015)
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| How you can eliminate 8 in 8r5? |
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Nanalal said:
(Oct 3, 2015)
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Sir How to solve these questions?
R5456*R2120/R460. |
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Abhijit said:
(Nov 20, 2015)
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| How to calculate value of R5 manually? |
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Sukanto Karmakar said:
(Dec 27, 2015)
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| I want to know how to calculate value of R5 manually? |
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Taj said:
(Feb 12, 2016)
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| How to calculates R5 in short cut method? |
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Gargi Sarma said:
(May 10, 2016)
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| I don't understand this sum clearly. Can anyone help me to understand this? |
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Uma Mahesh said:
(May 20, 2016)
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| Could you please explain this problem clearly? |
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Mahi said:
(Jul 8, 2016)
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| Anyone please explain R5. I was more confused in that. |
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Divya said:
(Oct 11, 2016)
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| We have to divide 17.88 by 8, so root 5 = 2.235. |
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Viju said:
(Dec 26, 2016)
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| Can you please explain in simple method Hw it come 2.235? |
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Ashwini said:
(Nov 11, 2017)
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| Here you divide 17.88 by 8 then why you multiplied 2.235 by 10? |
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Sangay said:
(Jul 23, 2018)
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| If 35 + 125 = 17.88, then what will be the value of 80 + 65? Please explain. |
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Wrick said:
(Nov 12, 2018)
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Easiest way is;
8√5=1788/100.
=> (10/8)*8√5 = (1788/100) * (10/8) = 223.5/10 = 22.35. |
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Honnu said:
(Jun 6, 2019)
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| Please anyone explain, How to calculate √5 value? |
