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Q.

The number that should be added to 5 9   to get 1 is:


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a

14 7  

b

14 9  

c

14 8  

d

14 10   

answer is B.

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Detailed Solution

Given a rational number 5 9  .
Let the number required = x,
According to the question,
5 9 +x=1 x= 1 1 5 9   L.C.M of 9 and 1 = 9.
Taking L.C.M of denominator,
x= 9+5 9 x= 14 9  
The number is 14 9  .
Hence, option 2 is correct.
 
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The number that should be added to −5 9   to get 1 is: