Ascientist mixes water (containing no salt) with a solution that contains 35% salt. she wants to obtain 245 ounces of a mixture that is 15% salt. how many ounces of water and how many ounces of the 35% salt solution should she use?

140 ounces of water and 105 ounces of 35% salt solution.

Explanation:

Let be the ounces of water that need to be added and be the ounces of 35% solution that need to to be added.

We know that the total of ounces of water and of 35% solution must be 245 ounces:

35% of   is the salt, and since no salt is added with addition of  liters of water, this must be equal to the amount of salt in the final 15% solution:

we solve for   and get:

We put this value into and solve for to get:

Thus we have 140 ounces of water and 105 ounces of 35% solution.

a and c

step-by-step explanation: