Question

A biologist has 40% solution and 10% solution of the same plant nutrient. How many cubic centimeters of each should be mixed to obtain 25 cc of 16% solution?

Answer 1

If x cc are 40%, then the rest (25-x) is 10%. So, adding up the nutrient content,

.40x + .10(25-x) = .16(25)

Answer 2

12

Answer 3

A biologist has a 40% solution and a 10% solution of the same plant nutrient. How many cubic centimeters of each solution should be mixed to obtain 25 cc of a 22% solution?

By using math provided by Steve above, I got these answers with this equation:

0.40x + 0.10(25-x) = 0.22(25)
x = 25.46875 (or 815/32)

10.1875 cc of 40% solution
4.6875 cc of 10% solution

However these answers were counted wrong so I have no idea what to do now :/

Answer 4

Reply to Chloe

nvm im just stupid and didn't put a decimal for the 10%

x=10
4cc of 40%
1.5cc of 10%

these were also wrong so now im still confused ://///