There are 90 total days in winter. If it snowed 30% of the days, on how many days did it snow? Please add an explanation I will mark you as Branliest, please help

The answer is the third choice

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.