Question

# The dimensions of a room are (9 m × 8 m × 6.5 m). It has one door of dimensions (2 m × 1.5 m) and two windows, each of dimensions (1.5 m × 1 m). Find the cost of whitewashing the walls at Rs 6.40 per square metre.

Solution

## We need to white wash the four walls of the room Here, l = 9 m; b = 8 m; h = 6.5 m Area of the four walls =                                  Now, the door and the windows are not to be white washed. Area of the door = Area of a window = Area to be white washed = area of four walls − (area of door + area of two windows)                                       = 221 − (3 + 2 $×$ 1.5)                                      = 221 − 6 = 215 m2                     Cost of whitewashing = Rs 6.40/m2 ∴ Cost of whitewashing 215 m2 = Rs 6.40 $×$ 215 = Rs 1376MathematicsRS Aggarwal (2017)Standard IX

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