In the scale used on a blueprint,1/4 inch represents 2 feet. on the blueprint, what is the length of a room with an actual length of 20 feet?

You would have to multiply 2 feet by 10 to get 20 feet, so multiply 1/4 by 10 to get 5/2 inches. The length of a 20 ft. room on a blueprint would be 5/2 or 2.5 inches.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.