the perimeter of the floor of a hall is 300 metre and its height is 6 metre find the cost of painting the four walls at the rate of rupees 15 per square metre​

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twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2