Brenda mails a package to a grandson that weighs 210 grams. about how many ounces is the package? use 1 ounce = 28.4 grams.

210 grams into ounces
210 / x = 28.4 / 1
cross multiply
210 = 28.4 x
divide both sides by 28.4
The answer is 7.39 ounces
That can be rounded to 7.4 ounces 

The package is 210 grams or 7.4 ounces.

Hope this helps :)

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.