College

Write an equation to represent each situation and then solve the equation.

a. Andre drinks 15 ounces of water, which is [tex]\frac{3}{4}[/tex] of a bottle. How much does the bottle hold? Use [tex]x[/tex] for the number of ounces of water the bottle holds.

b. A bottle holds 15 ounces of water. Jada drank 8.5 ounces of water. How many ounces of water are left in the bottle? Use [tex]y[/tex] for the number of ounces of water left in the bottle.

c. A bottle holds [tex]z[/tex] ounces of water. A second bottle holds 16 ounces, which is 1.5 times as much water. How much does the first bottle hold?

Answer :

Below is a step-by-step solution for each part.

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Part (a):
Andre drinks 15 ounces of water, which is [tex]\(\frac{3}{4}\)[/tex] of the bottle. Let [tex]\( x \)[/tex] represent the total number of ounces the bottle can hold. The situation can be expressed by the equation

[tex]$$
\frac{3}{4}x = 15.
$$[/tex]

To solve for [tex]\( x \)[/tex], multiply both sides of the equation by the reciprocal of [tex]\(\frac{3}{4}\)[/tex] (which is [tex]\(\frac{4}{3}\)[/tex]):

[tex]$$
x = 15 \times \frac{4}{3} = 20.
$$[/tex]

Thus, the bottle holds [tex]\(20\)[/tex] ounces of water.

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Part (b):
A bottle holds [tex]\(15\)[/tex] ounces of water and Jada drinks [tex]\(8.5\)[/tex] ounces of water. Let [tex]\( y \)[/tex] represent the number of ounces remaining in the bottle. The quantity left can be found by subtracting the amount Jada drank from the total water:

[tex]$$
y = 15 - 8.5.
$$[/tex]

Calculating the above gives

[tex]$$
y = 6.5.
$$[/tex]

So, there are [tex]\(6.5\)[/tex] ounces of water left in the bottle.

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Part (c):
A bottle holds [tex]\( z \)[/tex] ounces of water, and a second bottle holds [tex]\(16\)[/tex] ounces, which is twice as much as the first bottle. This can be modeled with the equation

[tex]$$
16 = 2z.
$$[/tex]

Solve for [tex]\( z \)[/tex] by dividing both sides by [tex]\(2\)[/tex]:

[tex]$$
z = \frac{16}{2} = 8.
$$[/tex]

Therefore, the first bottle holds [tex]\(8\)[/tex] ounces of water.

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Summary of Answers:
- (a) The bottle holds [tex]\(20\)[/tex] ounces of water.
- (b) There are [tex]\(6.5\)[/tex] ounces of water left.
- (c) The first bottle holds [tex]\(8\)[/tex] ounces of water.