Question

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

Answer 1

2 quarts would be the answer!!!

Step-by-step explanation:

Answer 2

I am pretty sure that to solve this task we havo to start with:
`12 + x = y 12(.30) + 1x = y(.40)`, which makes us go further :

`12 + x = y 3.6 + x = .4y`

`.4(12 + x) = 3.6 + x 4.8 + .4x = 3.6 + x`

`4.8 - 3.6 = x - .4x 1.2 = .6x`
`1.2/.6 = x 2 = x`
And it has become clear that the answer is 2 quarts have to be added so that we could have 40%