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There is no prime number equal to 28. I know you must find this disappointing.
From the beginning of a period to the beginning of the next one is on average 28 days.
28 = 4 x 7 so 4 = 1 seventh of 28 6 x 4 will therefore = 6 sevenths of 28, and as we know, 6 x 4 = 24
The floor and ceiling are each (28 x 15) = 420square feet.We don't know the area of the walls until we know how high the room is.
We know the gcf x LCM= AB where A and B are the two numbers. So the product of the two number we seek is 196 7 and 28 have a product of 196 and the gcf of 7 and 28 is 7. The LCM of 28 and 7 is 28. So the two numbers are 7 and 28. ( I started out by dividing 196 by 7 to get the 28)