Answer:
3.6 hours
Step-by-step explanation:
Blake can do work in hours = 9
Blake can do a part of work in 1 hour = 
Ned can paint the same room in six hours.
Ned can do a part of work in 1 hour = 
They can do a part of work together in 1 hour = 
=
Now they can do
part of work in hour = 1
So, they can do whole work in hours = 
= 
Hence it will take 3.6 hours to paint the room if they work together.
3x = 5(x + 3) - 3 |use distributive property: a(b + c) = ab + ac
3x = 5x + 15 - 3
3x = 5x + 12 |subtract 5x from both sides
-2x = 12 |divide both sides by (-2)
x = -6
Answer:
1:4
Step-by-step explanation:
Let X be the quantity of 30% acid and Y be the quantity of 5% acid.
0.3X + 0.05Y = 0.1(X+Y)
0.3X + 0.05Y = 0.1X + 0.1Y
0.3X - 0.1X = 0.1Y - 0.05Y
0.2X = 0.05Y
X/Y = 0.05/0.2
X/Y = 1/4
X:Y = 1:4
Answer:
$300
Step-by-step explanation:
Money that she earns per hour:
$180÷18=$10
30 hours:
30×$10=$300