Adump truck brought 1/3 of a ton of rock on the first trip, 1/2 of a ton on the second trip, and 4/5 of a ton on the third trip. what was the total weight of the rock?

We'll have to convert the denominators to a number that each of these three will add in to.

We'll use 30, since we can use 15 as we have a denominator of 2.

1/3 = 10/30

4/5 = 24/30

1/2 = 15/30

Now, we just add all the numerators

49/30

1 and 19/30

19 does not evenly divide into anything.

You answer is 49/30, or 1 and 19/30

10% of increase is the final answer! : )

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: