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Emily the blacksmith blends one alloy of silver that is 45% silver and another that is 95% silver. To the nearest ton, how much of each alloy is needed to make 139 tons of a 70% silver alloy?

please answer​

Sagot :

MrRoyal

Answer:

69.5 tons of Alloy 1 (of 45% silver) and 69.5 tons of Alloy 2 (of 95% silver) is needed to make 139 tons of 75% silver alloy

Step-by-step explanation:

Given

[tex]Alloy\ 1 = 45\%[/tex]

[tex]Alloy\ 2 = 95\%[/tex]

Required

How much of each alloy is needed for 70% silver alloy 139 tons

Let the amount of alloy 1 needed be x and the amount of 2 needed by y.

So:

[tex]x + y = 139[/tex]

Make y the subject

[tex]y = 139 - x[/tex]

The percentage of each needed is represented as:

[tex]45\% * x + 95\% * y = 139[/tex]

[tex]45\% * x + 95\% * y = 70\% * 139[/tex]

[tex]0.45x + 0.95y = 0.70 * 139[/tex]

[tex]0.45x + 0.95y = 97.3[/tex]

Substitute 139 - x for y in the above equations

[tex]0.45x + 0.95*(139-x) = 97.3[/tex]

[tex]0.45x + 0.95*139-0.95*x = 97.3[/tex]

[tex]0.45x + 132.05-0.95x = 97.3[/tex]

Collect Like Terms

[tex]0.45x -0.95x = 97.3-132.05[/tex]

[tex]-0.50x = -34.75[/tex]

Make x the subject

[tex]x = \frac{-34.75}{-0.50}[/tex]

[tex]x = 69.5[/tex]

Recall that:

[tex]y = 139 - x[/tex]

[tex]y = 139 - 69.5[/tex]

[tex]y = 69.5[/tex]

This implies that:

69.5 tons of Alloy 1 (of 45% silver) and 69.5 tons of Alloy 2 (of 95% silver) is needed to make 139 tons of 75% silver alloy

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