You have 2 gallons of juice for a school event with 100 students. If each cup holds 3 oz, how many cups can each student drink? How much will be left over.

1 cup per drink per student.

20 oz. left over

Step-by-step explanation:

given; 2 gallons for 100 students

1 cup holds 3 oz.

first, convert 2 gallons to oz.

1 gal = 160 oz.

2 gallons * 160 oz per 1 gal = 320 oz.

320 oz / 100 students = 3.2oz.

but 1 cup can only hold 3 oz.

therefore 3.2 - 3 = 0.2 oz * 100 = 20 oz. left over.

hope it helps.

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.