जॉइन Examsbookउत्तर : 3. "25"
If a+b=5 and 3a+2b=20,then (3a+b)will be :5
प्र: If a+b=5 and 3a+2b=20,then (3a+b)will be :
- 120false
- 215false
- 325true
- 430false
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उत्तर : 3. "25"
व्याख्या :
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.