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two sides of a rectangle are 20cm and 10cm. They are increased in the ratio 2:3 and 3:7. Find the percentage increased in its area?

  • MATHS - ,

    the way I understand the wording .....

    new length/20 = 3/2
    new length = 30

    new width/10 = 7/3
    new width = 70/3

    new area = 30(70/3) = 700
    old area = 20(10) = 200
    increase = 500
    percentage increase = 500/200 * 100% = 250%

  • MATHS - ,

    herefore, new area of rectangle = xy

    Original area = 20 × 10 = 200 cm2

    Therefore, increase in area of rectangle = new area of rectangle - original area = 700 cm2 - 200 cm2 = 500 cm2

    Now, percentage increase in area

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