X=pounds of coffee bean ($0.20 per pound)
y=pounds of coffee bean ($0.68 per pound )
We can suggest this system of equations:
x+y=120
(0.20x+0.68 y) / (x+y)=0.54 ⇒ (0.2x+0.68y)=0.54(x+y)
We can solve this system by substitution method.
x+y=120 ⇒ y=120-x
0.2x+0.68(120-x)=0.54[x+(120-x)]
0.2x+81.6-0.68x=0.54(120)
-0.48x+81.6=64.8
-0.48x=64.8-81.6
-0.48x=-16.8
x=-16.8/-0.48
x=35
y=120-x=120-35=85
Answer: the coffee mixture has 35 pounds of coffee beans sold to $0.2 a pound, and 85 pounds of coffee beans sold to $0.68 a pound, the solutions is reasonable because the price of a coffee mixture ($0.54 a pound) is greater than $0.2 and smaller than $0.68.
Answer:
More details please ._.
Step-by-step explanation:
Answer:
Joel need to practice this week = 
hour
Step-by-step explanation:
P.S - the exact question is -
As given
Total practice goal of Joel = 
hours
He practiced on : Monday - 
hours
Wednesday - 
hours
Thursday - 1 hour
Let the remaining practice = x hours
⇒ Total practice = hours
⇒ + + 1 + x =
⇒ 1 + 
⇒3 + x - 4 = 
⇒x - 1 = 
⇒x = 
⇒x = hour
∴ we get
Joel need to practice this week = hour
