MATHS

posted by .

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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    a rectangle is twice as long as it is wide. if both of its dimensions are increased by 4m, its area is increased by 88m^2 find the dimensions of the original rectangle Original rectangle = w for width and 2w for length. Area = w x …
  2. mat117/algebra

    If the sides of a square are increased by 3 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square?
  3. Math

    If the width of a rectangle is increased by 2 inches, the area is 140 square inches. If the legnth is increased by 1 inch, the area is 120 inches. Find the dimensions of the rectangle.
  4. algebra

    The sides of an rectangle was 5cm by 9cm. When both dimension were increased by an equal amounts the area of the rectangle increased by 120 cm^2 find the dimensions of the new rectangle.
  5. Maths

    A rectangle has legth & width in the ratio of 3:2.If the length is increased by 8 & width is increased by 50%.The ratio of new perimeter to origial perimeter is 8:5.Find the area of new rectangle.
  6. maths

    A rectangle has length & width in the ratio of 3:2.If the length is increased by 8 & width is increased by 50%.The ratio of new perimeter to original perimeter is 8:5.Find the area of new rectangle
  7. maths

    The length and breadth of a rectangle are (3x - 4y) and (2x - 3y) units resp. Find its area (i) If the length is increased by 3y units and the breadth is increased by 2y units, what would the area of the new rectangle be?
  8. Math

    Two sides of rectangle are 20 cm &10 cm. They are increased in ratio 2:3 & 3:7 . Find the percentage increase in its area?
  9. Geometry

    If a rectangle width is increased by 3, the rectangle becomes a square and the area of the rectangle is increased by 54u^2 what is the area of the original rectangle
  10. 8th grade maths

    The dimensions of rectangle is 40*25if the breadth and length are increased by 15% what is their new area in percentage

More Similar Questions