Question

Carlo buys $14.40 worth of grapefruit. Each grapefruit costs $0.80.
a. How many grapefruits does Carlo buy?
b. At the same store, Kahri spends one-third as much money on grapefruits as Carlo. How many grapefruits does she buy?

Answer 1

Answer:

a) 18 grapefruits

b) 6 grapefruits

Step-by-step explanation:

a) n = 14.4 / 0.80 = 18 grapefruits

b) n = (14.4 / 3) / 0.8 = 6 grapefruits

Answer 2

Answer:

$a.\ 18\ grapefruits\\\\b.\ 6\ grapefruits$

Step-by-step explanation:

a. Let be "x" the number of grapefruits Carlo buys.

You know that the cost of one grapefruit is $0.80.

Knowing that Carlo buys $14.40 of grapefuit, you can set up the following proportion:

$\frac{1\ grapefruit}{\ 0.80}=\frac{x}{\ 14.40}$

Solving for "x", you get:

$\frac{(\ 14.40)(1\ grapefruit)}{\ 0.80}=x\\\\x=18\ grapefruits$

b. Since Kahri spends one-third as much money on grapefruits as Carlo, you need to multiply 18 grapefruits by $\frac{1}{3}$ in order to calculate the number of grapefruits she buys. Then:

$(18\ grapefruits)(\frac{1}{3})=6\ grapefruits$