If a+b=5 and 3a+2b=20, Then value …
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Posted by Sudhanshu Baranwal 6 years, 10 months ago
- 2 answers
Naveen Sharma 6 years, 10 months ago
Question Must be : If a + b = 5 and 3a + 2b = 20, then 3a + b will be
Ans. 4) 25
a + b = 5 .............(1)
3a + 2b = 20 .........(2)
From (1), a = 5 - b
put this value in (2), we get
=> 3( 5 - b ) + 2b = 20
=> 15 - 3b + 2b = 20
=> - b = 5
=> b = -5
put values of b in (1), we get
=> a - 5 = 5
=> a = 10
Now, 3a + b = 3(10 ) - 5
= 30 - 5 = 25
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Sudhanshu Baranwal 6 years, 10 months ago
Ooo.
But this ques. had come in chs exam
0Thank You