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There are three areas.
A1=l•w
A1=2•1
A1=2 units^2
A2=l•w
A2=5•2
A2=10 units^2
A3=l•w
A3=2•1
A3=2 units^2
Area of shape is A
A=A1+A2+A3
A=2+10+2
A=14 units^2
Answer:
Step-by-step explanation:
For mixture problems, it is convenient to define a variable to represent the amount of the greatest contributor. Let x represent the amount of 22% solution in the mix. Then 4.8-x is the amount of 10% solution.
The amount of alcohol in the mix is ...
0.22x +0.10(4.8-x) = 0.12(4.8)
Eliminating parentheses, we have ...
0.22x -0.10x +0.10(4.8) = 0.12(4.8)
Subtracting (0.10)(4.8) and combining x-terms gives ...
0.12x = 0.02(4.8)
x = (0.02/0.12)(4.8) = 0.8 . . . . . divide by the x-coefficient
The scientist needs 0.8 L of 22% solution and 4.0 L of 10% solution.
X/7=7/15
Solving for x:
7(x/7)=7(7/15)
x=(7)(7)/15
x=49/15
Answer: x=49/15