An automobile's radiator has a capacity of fifteen quarts, and it currently contains twelve quarts of a thirty percent antifreeze solution. how many quarts of pure antifreeze must be added to strengthen the solution to forty percent?

2 quarts
3 quarts
4 quarts

*Hint: In order to solve this equation and make it easier for you, you must use proportions and figure out how many quarts there is in 10% of antifreeze solution.

The reason you need to find it for 10% is because only 10% is needed in order for the solution to reach 40%.

12/30 = x/10
2/5 = x/10
4 = x

The answer would be 4 quarts.

If you divide 0.1 and 0.6 you wii get 0.166666 which rounds to .167 which is answer b