Add fractions with unlike denominators 2/6+1/3

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.

Which ordered pair is a solution of the equation? 2x+3y=10

The ideal weight of a nickel is 0.176 ounce. to check that there are 40 nickels in a roll, a bank weighs the roll and allows for an error of 0.015 ounce in total weight