Agroup of adults plus a child attend a movie tickets cost $9 for adults and $6 for children the total for the movie is $78 write an equation to find the number of adults in the group

There are 8 adults because 78 - 6 = 72 and 72 divided by 9 =8.4 so round it and you get 8

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.