A gallon of unleaded gasoline weighs about 6 pounds. About how many ounces does 1 quart of unleaded gasoline weigh?

To change units without changing the value, we use the Multiplicative Identity (that is, 1).

In this problem, we need:

(1 gallon) = (6 pounds) or 1 = (

(1 quart) = (1/4 gallon) or (4 quarts) = (1 gallon) or 1 = (

(16 ounces) = (1 pound) or 1 =

We have:

1 quart

(1 quart) * 1

(1 quart) * ((1 gallon) / (4 quarts))

(1 quart) * ((1 gallon) / (4 quarts)) * ((6 pounds) / (1 gallon)) * ((16 ounces) / (1 pound))

(1) * (1/4) * (6/1) * (16/1) ounces [note: gallons, quarts, pounds all cancel out]

24 ounces

Checking: If a gallon weighs 6 pounds, a quart weighs 1.5 pounds [that is, 6/4].

That's 24 [that is, 1.5*16] ounces. Yes.

There is 32 ounces in 1 quart so therefore gasoline weighs 32 ounces.