## How many quarts of pure antifreeze must be added to 6 quarts of a 10% antifreeze solution to obtain a 40% antifreeze solution hint pure antifreeze is 100% antifreeze?

So you’ll need to add 1.71429 quarts of pure antifreeze to the 6 quarts of 10% antifreeze solution to obtain 7.71429 (6+1.71429) quarts of 30% antifreze solution.

## How many quarts of pure antifreeze must be added to 6 quarts of a 20 antifreeze solution to obtain a 40 antifreeze solution?

ANSWER: You should add 2 quarts of pure antifreeze.

**How many quarts of pure antifreeze must be added to 9 quarts of a 30% antifreeze solution to obtain a antifreeze solution?**

Thus 2.6 quarts must be added to 9 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution.

**How many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a antifreeze solution?**

So, 3.2 quarts of pure antifreeze is required.

### How many quarts of pure antifreeze must be added to 8 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?

Answer. 2 quarts of the pure antifreeze must be added.

### How many quarts of pure antifreeze must be added to 7 quarts of a 10% antifreeze solution to obtain a 20% antifreeze solution?

So to make 7 quarts of 10% solution 20% we must add 0.875 quarts of pure antifreeze to make a total of 7.875 quarts.

**How many quarts of pure antifreeze must be added to 7?**

0.90(7 quarts)=6.3 quarts of water. To make a 20% solution (80% water)with 6.3 quarts of water, we need 6.3/. 80=7.875 quarts total. So to make 7 quarts of 10% solution 20% we must add 0.875 quarts of pure antifreeze to make a total of 7.875 quarts.

**How many quarts of pure antifreeze must be added to 3 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?**

3 Answers By Expert Tutors 50parts/20parts = 3quarts/x quarts and x = 1.2 quarts. The 3 quarts of 30% antifreeze solution contains 0.3 x 3 = 0.9 quarts of pure antifreeze solute. So, adding 1.2 quarts (2.1 – 0.9 = 1.2) of pure antifreeze will do the job.

#### How many quarts of pure antifreeze must be added to 9 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution?

SOLUTION: how many quarts of pure antifreeze must be added added to 9 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution. Let x=amount of pure antifreeze. When we add this to the 9 quarts of the 40%, we have 9+x quarts. Solving for x gives x=1.8 quarts of pure antifreeze.

#### How many quarts of pure antifreeze must be added to 7 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?

80=7.875 quarts total. So to make 7 quarts of 10% solution 20% we must add 0.875 quarts of pure antifreeze to make a total of 7.875 quarts.

**How many quarts of pure antifreeze must be added to 7 quarts of a 20%?**

0.90(7 quarts)=6.3 quarts of water. To make a 20% solution (80% water)with 6.3 quarts of water, we need 6.3/. 80=7.875 quarts total.

**How many quarts of pure antifreeze must be added to 6 quarts of a 10% antifreeze solution to obtain a 50% antifreeze solution?**

3.6 qts. of pure antifreeze must be added to the solution.