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Introduction to Rational Numbers

Comparison of Rational Numbers

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Life Sketch of Some Scientists - I

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Types of Substances

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  • 4a by 3a

    Q

    its easy
    4a by 3a is 12a2

    A
  • What are you doing

    Q

    A
  • A well of diameter 150 cm has a stone parpet around it. If the length of outer edge of the parpet 770 cm, then find the width of parpet.

    Q

    Given, the diameter of the well (d) = 150 cm.

    Let radius and diameter of the parapet is R and D respectively.

    Sine, length of the outer edge of the parapet = 770 cm.

    Therefore,

    2πR = 770 cm

    2R = 770 / π = (770 x 7 )/22 = 245 cm

    D = 245 cm.

    Now, width of the parapet = ( diameter of parapet - diameter of the well)/2 = (245 - 150 )/2 = ( 95)/2 =  47.5 cm

    Hence, width of the parapet is  47.5 cm.

    A
  • Ajayendra pratap

    Q

    kya?

    A
  • profit &loss

    Q

    s.p. of 20 notebook = c.p. of 0 notbook
    let s.p. of 1 notebook be x
    then
    s.p. of 20 notebooks =20x
    sp of 10 notebooks =10x
    cp of 10 notbooks =20x
    cp > sp
    loss = cp - sp
           = 20x - 10x
           =10x
    loss % = loss * 100%
                 cp
              = 10x  * 100%
                 20x
      loss%       = 50%

    A
  • maths question & answer

    Q

    science question and answer last two year model paper

    A

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