(d) The height of a house having three rooms of the dimension 9 ft. x 12 ft., 14 ft. x 16 ft. and 12 ft. x 14 ft. respectively is 9 ft. What will be the amount required to paint on all walls from inside at the rate of Rs. 160 per square feet? Find it.
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Explanation: Newton was the first to conduct this experiment on passing light through a prism. He let
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