SAT Mathematics Practice Test 4

Because there are 16 ounces in 1 pound, a 3-pound pizza weighs $3\times 16=48$ ounces. One half of the pizza weighs $\frac{1}{2}\times 48=24$ ounces, and one-third of the half weighs $\frac{1}{3}\times 24=8$ ounces.Alternatively $\frac{1}{2}\times \frac{1}{3}=\frac{1}{6}$, since, cutting the pizza into halves and then intothirds results in a pizza that is cut into sixths. Therefore, each slice of the 48-ounce pizza weighs $\frac{1}{6}\times 48=8$ ounces.
Choice A is incorrect and is the result of cutting each half into sixths rather than thirds. Choice B is incorrect and is the result of cutting each half intofourths rather than thirds. Choice D is incorrect and is the result of cutting the whole pizza into thirds.