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ritahastie7533
12.07.2019 •
Mathematics
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.
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Ответ:
We find the volume of the path in cubic meters and multiply by 106 bags per cubic meter.
The path is an annulus with inner radius r=7 m and outer radius s=7+2=9 m and depth in meters d=50/1000 = 0.05 m.
The volume is the area of the path times its depth; the area is the difference of the area of the outer and inner circles of the annulus.
We need
533
Ответ:
=2%/(2%+13%)
= about 13.333%
Closest answer is 15%