Aptitude - Surds and Indices - Discussion
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Read more:"We cannot solve our problems with the same thinking we used when we created them."
- Albert Einstein
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If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:
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Answer: Option D
Explanation:
3x - y = 27 = 33  x - y = 3 ....(i)
3x + y = 243 = 35 x + y = 5 ....(ii)
On solving (i) and (ii), we get x = 4.
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Anu said:
(Tue, Mar 22, 2011 03:38:44 AM)
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| How is (i) and (ii) solved and we get answer as 4?? |
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Anu said:
(Thu, Jun 23, 2011 08:30:45 PM)
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| 2x=8; so x=4 ie.,(x+x)(-y+y) (3+5) |
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Caroline said:
(Thu, Sep 8, 2011 09:08:35 AM)
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x - y = 3
x + y =5
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2x =8
Therefore, x = 4. |
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