Question

Destiny bought a new tea set and wants to have a tea party. Her new teapot makes 1.5 liters of tea. Each of her teacups holds 150 milliliters. She plans to give 1 teacup to each person, including herself. If she wants to use up all of her tea, how many friends should she invite?

Answer 1

9

Explanation:

Destiny wants to know how many additional people she needs to invite to use up 1.5 L of tea, if each of them and Destiny all get 150 mL of tea.

Setup

Let f represent the number of invited friends. We know that 150 mL is 0.150 L, so the amount of tea Destiny wants to serve is ...

(f +1)(0.150) = 1.50

Solution

f +1 = 10 . . . . . . . . . . . divide by 0.150

f = 9 . . . . . . . . . . subtract 1

Destiny should invite 9 friends to her tea party.