80 is 15% of what number

So 15%=15/100=3/20 so
80=3/20 of a number
multiply both sides by 20/3 to clear fraction
1600/3=a number
533.33
te number is 533.3333333

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.