At noon, a block of ice was taken out of the freezer. At 2pm it
weighed 78 lbs. At 5pm, it weighed
41 lbs. How much does it weigh at 8pm?
?

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.

She will need 5/8 bags for each square yard.