Answer:
Step-by-step explanation:
Let 
represent the amount of money he initially started with.
After he spent 20% on books, he will have 
of his initial money left. We can represent this as 
.
Following that, the boy spends 20% of the remainder of his money on food. Similarly, he will have of the remainder of money he had left after he purchased the books. Therefore, he ends up with 
of his money left.
Since we're given that he had $2,000 after all these transactions, we have the following equation:
Divide both sides by 0.64 to isolate and solve for :
Therefore, the boy had $3,125 to begin with.
First we can figure out an hourly rate at which cars are washed. To do so, we need to divide 5 cars by 3 hours.
Then we need to multiply 7.5 hours by the rate. This will tell us how many cars are washed in 7.5 hours.
= 12.5 cars
Answer:
H V
1 4π
2 8π
3 12π
There is a linear relationship between height and volume in this example. With a constant radius value for this table, the volume is 4 times the size of the height of the cylinder.
