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Answer:
756
Step-by-step explanation:
Area of triangle
Area of rectangle
Total area
Density = mass / volume
Givens
Density = 13.6 grams / cm^3
mass = 47 grams.
Solve
D = m/v
13.6 = 47 / volume Multiply by volume
13.6 * volume = 47 Divide by 13.6
volume = 47 / 13.6
Volume = 3.46 ccs
Let x=the number of $1 bills she has, and let y=the number of $5 she has. From the information given, we can say:
x+5y=40
x+y=12
When you subtract the first equation from the second equation, you get:
x+5y-x-y=40-12
4y=28
y=7
Therefore, Hermione has 7 $5 bills in her purse.