Answer:
1200
Step-by-step explanation:
n = 0.08 r + 7400
n = 7496, r = ?
7496 = 0.08r + 7400
7496 - 7400 = 0.08r
96 = 0.08r
r = 96/0.08
r = 1200
Step-by-step explanation:
first a little help, how they got the equations :
in total they need 15 liters.
so, whatever x and y are, but together they must be 15 L.
x + y = 15
then, we are mixing x liters of 20% alcohol with y liters of 100% alcohol, that have to result in a 40% solution of (x+y) liters :
0.2x + y = 0.4(x+y)
we know from the first equation that x+y = 15, so the second equation is actually
0.2x + y = 0.4 × 15 = 6
so, we have
x + y = 15
0.2x + y = 6
do you notice something ? there is a "+ y" in both equations.
so we can actually subtract the second equation from the first, eliminate y and solve for the remaining x. and then use one of the original equating to get also y :
x + y = 15
- 0.2x + y = 6
---------------------
0.8x 0 = 9
0.8x = 9
x = 9/0.8 = 11.25 liters
x + y = 15
11.25 + y = 15
y = 15 - 11.25 = 3.75 liters
D. X = 10
6x-20= 40
6x=40+20
6x=60
X=10
(7^x - cbroot(729)) / 2z
(7^7 - 9)) / 2(4)
49 - 9 / 8
40 / 8
5
I hope this helps out!
