Answer:
We have 3% and 7% solutions. (We'll call these x and y)
We need 64 ml of 6% solution.
Setting up two equations:
A) x + y = 64 ml
B) .03x + .07y = (.06 * 64)
Multiplying A) by -.03
A) -.03x -.03y = -1.92 then adding this to B)
B) .03x + .07y = 3.84
.04y = 1.92
y = 1.92 / .04 = 48 ml of 7% solution
x = 16 ml of 3% solution
DOUBLE-CHECK
16 * .03 + 48 * .07 = 3.84 ml in 64ml
3.84 / 64 = .06 per cent!!
Source: https://www.1728.org/mixture.htm
Step-by-step explanation:
