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loris [4]
3 years ago
6

I DON’T UNDERSTAND THIS!!!

Mathematics
1 answer:
storchak [24]3 years ago
6 0
The answer to the question

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A metalworker has a metal alloy that is 15​% copper and another alloy that is 60​% copper. How many kilograms of each alloy shou
coldgirl [10]

18 kg of 15% copper and 72 kg of 60% copper should be combined by the metalworker to create 90 kg of 51% copper alloy.

<u>Step-by-step explanation:</u>

Let x = kg of 15% copper alloy

Let y = kg of 60% copper alloy

Since we need to create 90 kg of alloy we know:

x + y = 90

51% of 90 kg = 45.9 kg of copper

So we're interested in creating 45.9 kg of copper

We need some amount of 15% copper and some amount of 60% copper to create 45.9 kg of copper:

0.15x + 0.60y = 45.9

but

x + y = 90

x= 90 - y

substituting that value in for x

0.15(90 - y) + 0.60y = 45.9

13.5 - 0.15y + 0.60y = 45.9

0.45y = 32.4

y = 72

Substituting this y value to solve for x gives:

x + y = 90

x= 90-72

x=18

Therefore, in order to create 90kg of 51% alloy, we'd need 18 kg of 15% copper and 72 kg of 60% copper.

6 0
3 years ago
Benito spent $1761 to operate his car last year. Some of these expenses are listed below. Benito's only other expense was for ga
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The averge per mile is 4.06
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gavin bought 2 1/2 cubic yards of topsoil for $75 what is the unit rate in cost per cubic yard for the topsoil
Kruka [31]

Answer:

$30

Step-by-step explanation:

Divide the cost ($75) by the yards (2 1/2) to get $30 per yard.

7 0
3 years ago
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Evaluate x² + 4x + 1 when x = -3
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Substitute -3 to x

(-3)^2 + 4(-3) + 1

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= -2
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2 years ago
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Solve for y.
natima [27]

Answer:

y= 10/3 + x/3

Step-by-step explanation:

not sure how to explain this

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2 years ago
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