Mathematics
Grade9
Easy

Question

You can mow 10 square yards of grass in one minute. How long does it take you to mow a triangular plot with height 25 yards and base 24 yards? How long does it take you to mow a rectangular plot with base 24 yards and height 36 yards?

  1. 30 minutes and 2 hours
  2. 50 minutes and 89.7 minutes
  3. 30 minutes and 86.4 minutes
  4. 40 minutes and 3 hours

The correct answer is: 30 minutes and 86.4 minutes


    30 minutes and 86.4 minutes
    Area of the triangular plot = ½ x base x height = ½ x 24 x 25 = 300 sq yards.
    10 sq yards are mowed in 1 minute
    300 sq yards are mowed in 1 x 300/ 10 minutes = 30 minutes.

    Area of rectangular plot = length x breadth = 24 x 36 sq yards = 864 sq yards.
    10 sq yards are mowed in 1 minute
    864 sq yards are mowed in 1 x 864/10 minute = 86.4 minutes.

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