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sukhopar [10]
3 years ago
7

Can anyone please help me really struggling

Mathematics
1 answer:
almond37 [142]3 years ago
8 0

Answer:

C 862 square units

Step-by-step explanation:

the length of side of Octogan is given by the square. so length of each side is 15

Area of an Octogan

A=2(1+2)a^2

A=2(1+2)15^2 = 1086.4 square units

A= l X w

A= 15 X 15 = 225 square units

1086.4 - 225 = 861.4 square units

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How much of an alloy with 30% copper must be added to 25 pounds of a second alloy that is 20% copper to create a 27% alloy? 33.8
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Answer:

58.33 lbs.

Step-by-step explanation:

There are already 25 lbs of alloy of copper

Of this 25 lbs, 20% is pure i.e. copper content = 25(0.5) = 5lbs.

Now available is

Copper      Other metals

5 lbs                20 lbs

Let x lb of 30% copper is added.

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Percentage pure = \frac{5+0.3x}{25+x} =27%

Simplify to get

\frac{5+0.3x}{25+x} =\frac{27}{100} \\\\Cross multiply:\\27(25+x) =100(5+0.3x)\\500+30x =675 +27x\\3x = 175\\x = 175/3 = 58.33 lbs

Hence answer is 58.33 lbs should be added.



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