Eric and Charlotte collected donations for the food bank. Charlotte collected 3 times
the amount of Eric's donations minus $20.
Eric and Charlotte combined their
donations and spent half of the money on
canned food. The rest of the money, $50,
was donated to the food bank directly.
How much money did each student
collect?

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.

Can you explain what u need