If there were 140 problems how many could you miss if you wanted 80%?
like if you did a test, that had 140 problems and you wanted to at leas get 80%, how many problems would you be able to miss?

You'd have to get 112 out of 140 in order to get an 80% right on the dot

You would only have to miss 28 problems to get 80%.

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.