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If a+b=5 and 3a+2b=20,then (3a+b)will be :

Correct Answer: 25

Explanation:

a+b=5   ...(1)    and    3a+2b=20 ...(2)


 


Multiplying (1) by 2 and subtracting from (2), we get : a=10.


 


Putting a=10 in (1), we get : b=-5


 


Therefore,   (3a+b) = 3 x 10+(-5)=30-5=25.


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