To make lemonade, i use a ratio of $7$ parts water to $1$ part lemon juice. if i want to make a gallon of lemonade, and there are four quarts in a gallon, how many quarts of water do i need? write your answer as a proper or improper fraction.

In order to solve this problem, we need our knowledge on ratio and proportion for us to set up an equation. A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal. We do as follows:

7 parts water / 1 part lemon = 4 quarts - x / x

where x is the quarts lemon needed

Solving for x,

x = 0.5
water needed = 4-x = 3.5 quarts water is needed

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jajumonac jajumonac · Answer 2 · 2020-01-09T22:33:10-05:00

Answer:

3.5 gallons of water.

Step-by-step explanation:

According to the problem, water and lemon have the ratio 7:1, 7 parts of water per 1 part of lemon.

Also, we know that one gallon have four quarts, and we want to make 1 gallon of lemonade. So, the amount of water would be $x$, because the question is about water, and the amount of lemonade would be $4 \ quarts - x$, because it would be the difference between the total 4 quarts (1 gallon) and the amount of water.

Now, using the ratios, we have:

$\frac{7 \ water}{1 \ lemon}=\frac{x \ water}{4 - x \ lemon} \\28-7x=x\\7x+x=28\\8x=28\\x=\frac{28}{8}=3.5$

Therefore, the amount of water needed is 3.5 gallons, and 0.5 gallons of lemon.