SOLUTION: You are laying a concrete border around a circular pond. The pond is 7 metres in diameter and is surrounded by a path 2 metres wide. The concrete needs to be 50 millimetres deep.

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Question 1084916: You are laying a concrete border around a circular pond.
The pond is 7 metres in diameter and is surrounded by a path 2 metres wide.
The concrete needs to be 50 millimetres deep.
You are using premixed bagged concrete.
1 cubic metre (m³) requires 106 x 20 kg bags.
How many 20 kg bags of premixed concrete do you need?
Round your answer to the nearest whole number.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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You are laying a concrete border around a circular pond.
The pond is 7 metres in diameter and is surrounded by a path 2 metres wide.
:
The radius of the pool = 3.5 m; the overall radius including the border = 5.5m
Find the area of the concrete border
overall area - pool area = border area
A = pi%2A5.5%5E2 - pi%2A3.5%5E2
A = 56.55 sq m
:
The concrete needs to be 50 millimetres deep.
Find the volume of the concrete, change 50 mm to .05 m
56.55 * 05 = 2.8275 cu/meters
:
You are using premixed bagged concrete.
1 cubic metre (m³) requires 106 x 20 kg bags.
find the no. of bags
106 * 2.8275 = 300
How many 20 kg bags of premixed concrete do you need?
300 bags
Round your answer to the nearest whole number.
:
Corrections made 1-18-2018.