X = amount of 50% solution
y = total amount after mixing
Note that the amount of alcohol in the 20% solution is 80 (0.2) = 16 oz.
We have 2 unknowns, so we need 2 equations:
first, we can write the equation for the total volume:
y = x + 80
next, apply the percentages to get an equation for the amount of alcohol:
0.4 y = 0.5 x + 16
Finally, solve the pair of equations (in this case, by substitution of the 1st into the second:
0.4 (x + 80) = 0.5x + 16
0.4 x + 32 = 0.5X + 16
rearrange and combine like terms:
0.1x = 16
x = 160
from the 1st equation:
y = 160 + 80 = 240
The standard form is
-x + y = 19
Answer:
Step-by-step explanation:
One-fourth x + 2 = 
Next, we Expand the Left hand Side by multiplying each term in the bracket by 1/4
Bringing terms with x to the left Hand Side i.e. collecting like terms
On Cross multiplying
7x = -7 X 8
x=-8
Answer:
the answer is 18
Step-by-step explanation:
139 is suppose to be 140 and 18 is suppose to be 20, 140 x 20 = 2800
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