Answer:
In order to subtract a whole number from a fraction, you first have to turn the hole number into a mixed fraction.
Step-by-step explanation:
Say your fraction was 2/3 and your whole number was 5.
They have to have like denominators
5/1 - 2/3 = 15/3 - 2/3
15/3 - 2/3 = 13/3
13/3 = 4 1/3
He will mix some 20% solution and some 70% solution to make 60% solution.
Let x = number of liters of 20% solution.
Let y = number of liters of 70% solution.
He wants to make 50 liters of 60% solution, so
x + y = 50 First Equation
The amount of acid in x amount of 20% solution is 20% of x, or 0.2x
The amount of acid in y amount of 70% solution is 70% of y, or 0.7y
The amount of acid in 50 liters of 60% solution is 60% of 50 liters, or 0.6 * 50 = 30
Now we add the amounts of acid.
0.2x + 0.7y = 30 Second Equation
x + y = 50
0.2x + 0.7y = 30
-0.2x - 0.2y = -10
0.2x + 0.7y = 30
------------------------
0.5y = 20
y = 40
x + y = 50
x + 40 = 50
x = 10
Answer: He needs 10 liters of 20% solution and 40 liters of 70% solution.
Answer: i believe the answer is 4
Step-by-step explanation:
she can have
green red yellow purple
green yellow purple orange
green red purple orange
green red yellow orange
i couldn't see anymore combos but i could be wrong
No solution / no x
D=b^2-4*a*c -> D=-4^2-4*1*21 -> D=-28 -> D<0, no solution
