We begin with 100 mL of the 2% saline solution, and will add x mL of the 0.5% saline solution. The total volume of the mixture will be (100 + x) mL. The total mass of salt will be:
(100)(2%) + (x)(0.5%) = 2 + 0.005x
This would have to be 0.79% of the total volume:
(100+x)(0.79%) = 0.79 + 0.0079x
Equating:
x = 417.24 mL
This rule is known as PEMDAS
In an algebraic equation follow PEMDAS
P= first calculate anything with parantheses
E= then calculate anything with exponents
M= calculate any multiplication
D= calculate any division
A= calculate any addition
S= calculate any subtraction
you must do these in that order
hope this helps:)
2y+4=2(y+2)
2y+4=2y+4
4=4
so the answer is all real numbers or infinite solutions
