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1582

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

  • 1
    20
  • 2
    15
  • 3
    25
  • 4
    30
  • Show Answer
  • Workspace

Answer : 3. "25"
Explanation :

Answer: C) 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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