Answer:
The cost of leveling the ground is Rs 5340.6
Step-by-step explanation:
Given:
Diameter of the road roller = 90 cm
Length of the road roller = 2m 10 cm
Total number of number of revolution = 400
Cost of leveling = Rs 2.25 per square meter
To Find:
Total cost of leveling the ground = ?
Solution:
Step 1 : Finding the surface area of the road roller
Converting cm to m
90 cm = 0.9 m
2m 10 cm = 2 + 0.1 m = 2.1 m
Surface area of the road roller = surface are of the cylinder
=
r= radius of the road roller
r=
r=0.45
Now surface area is
=>
=>
=>
=>5.934
Step 2 : Finding the area of the ground
Total area of the ground = Surface area of the road roller X number of revolutions
=>
=> 2373.6
Step 3 : Finding the cost of leveling
Total cost of leveling = area of the ground X Cost per square meter
=>
=>5340.6
Hello!
Let's write some important information contained in the exercise:
• hotdogs: $2.59 (,x,)
,• hamburgers: $5.29 (,y,)
He needs 11 packages. Let's write it:
• x + y = 11
He spent a total of $39.29. We can write it as:
• 2.59x + 5.29y = 39.29
Now, let's solve these two equations as a linear system:
First, let's isolate x in equation A:
Now, we will replace where's x by 11-y in equation B:
As I called the hamburgers as 'y', we know that he bought 4 packages of hamburgers.
Here's the solution,
volume of cylinder :
=》
where,
now, let's solve
=》
=》
So, volume = 2000.2 cm³