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  • Question
  • If a - b = 3, a2+b2=29 , find the value of ab.


  • Options
  • A. 10
  • B. 12
  • C. 15
  • D. 18

  • Correct Answer
  • 10 

    Explanation

    2ab= a 2 + b 2 - a 2 - b 2

     

    29-9=20

    =>ab=10


  • Simplification problems


    Search Results


    • 1. Two numbers are such that the sum of twice the first number and thrice the second number is 36 and the sum of thrice the first number and twice the second number is 39. Find the difference between the numbers?

    • Options
    • A. 15
    • B. 3
    • C. 9
    • D. 6
    • Discuss
    • 2. An owner of a Dry fruits shop sold small packets of mixed nuts for Rs. 150 each and large packets for Rs. 250 each. One day he sold 5000 packets, for a total of Rs. 10.50 lakh. How many small packets were sold ?

    • Options
    • A. 2000
    • B. 3000
    • C. 2500
    • D. 3500
    • Discuss
    • 3. If 3x+7=x2+p=7x+5 , what is the value of P ?

    • Options
    • A. 17/2
    • B. 25/3
    • C. 33/4
    • D. 41/5
    • Discuss
    • 4. Simplify the following : 373+353+283-3x37x35x28372+352+282-37x35-35x28-37x28 ?

    • Options
    • A. 100
    • B. 1
    • C. 4
    • D. 0
    • Discuss
    • 5. In a slip test, K got the 15th rank and he was 44th from the bottom of the list of passed students. 4 students did not take up the slip test and 3 students were failed. What is the total strenght of the class ?

    • Options
    • A. 63
    • B. 62
    • C. 64
    • D. 65
    • Discuss
    • 6. If x = 1 - q and y = 2q + 1, then for what value of q, x is equal to y ?

    • Options
    • A. 0
    • B. 1
    • C. -1
    • D. -2
    • Discuss
    • 7. 18800÷470÷20=?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 8. 50.003% of 99.8÷49.988 = ?

    • Options
    • A. 2
    • B. 0
    • C. 1
    • D. 50
    • Discuss
    • 9. If ab=45 and bc=1516 , then c2-a2c2+a2 is :

    • Options
    • A. 7/5
    • B. 7/25
    • C. 7/125
    • D. 7
    • Discuss
    • 10. 5 + 2 x 10/2 = ?

    • Options
    • A. 15
    • B. 35
    • C. 10
    • D. 20
    • Discuss


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