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  • Question
  • (0.49)4 x (0.343)4 ÷ (0.2401)4 x = (70 ÷ 100)? + 3 ?


  • Options
  • A. 3
  • B. 1
  • C. 4
  • D. 7

  • Correct Answer


  • Explanation

    The given question is,
    (70 ÷ 100)? + 3 = (0.49)4 x (0.343)4 ÷ (0.2401)4
    As we know that
    70 ÷ 100 = 0.7
    0.49 = 0.7 2
    0.343 = 0.7 3
    0.2401 = 0.7 4

    Put these value in given question , we will get
    ? (0.7)? + 3 = (0.72)4 x ( 0.73 )4 ÷ ( 0.74 )4
    ? (0.7) ? + 3 = 0.7 2 x 4 x 0.7 3 x 4 ÷ 0.7 4 x 4
    ? (0.7) ? + 3 = 0.7 8 x 0.7 12 ÷ 0.7 16
    Apply the law of Fractional Exponents and Laws of Exponents
    (am)(an) = am+n
    am÷an=am-n
    Or
    am/an=am - n
    we will get,
    ? (0.7)? + 3 = (0.7) 8 + 12 - 16
    ? (0.7)? + 3 = (0.7) 20 - 16
    ? (0.7)? + 3 = (0.7) 4
    On comparing the exponents both sides, we get
    ? + 3 = 4
    ? ? = 4 - 3 = 1


  • Simplification problems


    Search Results


    • 1. 
      5/8 x 23/5 ÷ 4/9 =?

    • Options
    • A. 9/4
    • B. 8/4
    • C. 4/9
    • D. 6/15
    • Discuss
    • 2. 
      If (a2 + 1/a2) = 17/4, then what is (a3 - 1/a3) equal to?

    • Options
    • A. 75/16
    • B. 63/8
    • C. 95/8
    • D. None of these
    • Discuss
    • 3. 
      If a + 1/b = 1 and b + 1/c = 1, then c + 1/a =?

    • Options
    • A. 4
    • B. 24
    • C. 3
    • D. 1
    • Discuss
    • 4. 
      The value of (1 + 1/2) (1 + 1/3) (1 + 1/4) ..... (1 + 1/150) is?

    • Options
    • A. 65.5
    • B. 50.5
    • C. 105
    • D. 75.5
    • Discuss
    • 5. 
      If a + 1/a = ? 3, then the value of a6 - 1/a6 + 2 will be

    • Options
    • A. 3?3
    • B. 5
    • C. 1
    • D. 2
    • Discuss
    • 6. 
      (2.247)3 + (1.730)3 + (1.023)3 - 3 x 2.247 x 1.730 x 1.023 / ( (2.247)2 + (1.730)2 + (1.023)2 - (2.247 x 1.730) - (1.730 x 1.023) - (2.247 x 1.023) )

    • Options
    • A. 1.730
    • B. 4
    • C. 5
    • D. 5.247
    • Discuss
    • 7. 
      ( 8.73 x 8.73 x 8.73 + 4.27 x 4.27 x 4.27 ) / ( 8.73 x 8.73 - 8.73 x 4.27 + 4.27 x 4.27 ) is equal to?

    • Options
    • A. 11
    • B. 13
    • C. 11/7
    • D. None of these
    • Discuss
    • 8. 
      If x = ( ?2 + 1 ) / ( ?2 - 1 ) and x - y = 4?2, then the value of (x2 + y2) is?

    • Options
    • A. 34
    • B. 38
    • C. 30
    • D. 32
    • Discuss
    • 9. 
      1/(1 x 4) + 1/(4 x 7) + 1/(7 x 10) + 1/(10 x 13) + 1/(13 x 16) =?

    • Options
    • A. 5/16
    • B. 3/16
    • C. 7/16
    • D. 11/16
    • Discuss
    • 10. 
      If x + a/x = 1, then the value of ( x2 + x + a ) / (x3 - x2) is?

    • Options
    • A. -2
    • B. -a/2
    • C. 2/a
    • D. -2/a
    • Discuss


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