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Elan Coil [88]
3 years ago
10

Someone help me with this please !

Mathematics
1 answer:
Juli2301 [7.4K]3 years ago
4 0

Step-by-step explanation:

a I think if I didn't help sorry

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A jeweler has 5 rings, each weighing 12 g, made of an alloy of 20% silver and 80% gold. She decides to melt down the rings and a
Aleksandr [31]

We have been given that a jeweler has 5 rings, each weighing 12 g, made of an alloy of 20% silver and 80% gold.

Upon melting all 5 rings, the weight of the material will be 12*5=60 grams.

We have been given that the alloy contains 20% silver and 80% gold. Further, let us assume that x grams of silver are added to the melted material so that it has 64% gold and 36% silver.

Therefore, we can set up an equation:

\text{Amount of gold before mixing}=\text{Amount of gold after mixing}

Therefore, we get an equation:

80\%\text{ of 60 gram}=64\%\text{ of (x+60) gram}

0.80*60=0.64(x+60)\\48=0.64x+38.4\\0.64x=9.6\\x=\frac{9.6}{0.64} \\x=15

Therefore, 15 grams of silver must be added to the melted material in order to reduce the gold content to 64%.

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3 years ago
a landscaper estimates that a set of plants can be installed in six hours by 12 workers the landscaper wants to finish a set of
Naddik [55]
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What is y=3x-3/4 on a graph
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Triangle ABC is congruent with triangle CDA Find the value of the pronumeral x.
brilliants [131]

Answer:

x = 25

Step-by-step explanation:

Since the triangles are congruent then corresponding angles are congruent.

That is ∠ D and ∠ B are corresponding angles and congruent, thus

4x - 20 = 2x + 30 ( subtract 2x from both sides )

2x - 20 = 30 ( add 20 to both sides )

2x = 50 ( divide both sides by 2 )

x = 25

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Which values are in the solution set of the compound inequality: 4(x+3)≤0 or 14x+1>3
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Answer: 69

Step-by-step explanation: The hypotenuse of the atom and it’s vastly large core equals the square root of 420 divides by 5.4 which equals 69.

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