Achemist is using 371 milliliters of a solution of acid and water. if 17.7% of the solution is acid, how many milliliters of acid are there? round your answer to
the nearest tenth.

There are 65,7 ml of acid.

Step-by-step explanation:

This is a percent problem. When we have a total (in this case 371 ml of a solution), it's value is the 100%. As only 17,7% is only the part we are interested in (acid), we shall get a cross-multiplication like this one:

371 ml ----------- 100%

x=       ------------17.7%

This must be resolved multiplying 17.7 x 371 and dividing the result by 100.

This number rounded to the nearest tenth is 65,7.

5x+2x=49

7x=49

x=7. 35 apples