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inna [77]
3 years ago
12

20 is what percent of 50?

Mathematics
1 answer:
djverab [1.8K]3 years ago
3 0
We can rephrase the question as "What percent of 50 is 20?".
"What percent ..." is an unknown. We'll use the variable x to represent this unknown.

The word 'of' in mathematics can mean 'multiply'. Likewise the word 'is' can mean 'equal'.

Now we have the phrase "20 equals to x times 50".

Or in an equation: 20 = x * 50

Solve for x.

20 = x * 50
\frac{20}{50} = x <-- Divide both sides by 50

Simplify the fraction.

\frac{20}{50} = \frac{2}{5}

Convert the fraction into a decimal.

\frac{2}{5} = 0.4

Convert the decimal into a percent.

0.4 = 40%

So, 40% is the answer.
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These are simultaneous equations.

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3 years ago
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Michelle, lori, and patti buy lunch together. The total bill was $45. If michelle pays 35% of the total bill and lori pays 48% o
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Answer:

$7.65

Step-by-step explanation:

step one:

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3 years ago
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3x-2y=-1. <br> Y=-x+3. <br> Is (1,2) a solution do the system?
andrew-mc [135]

Answer:

Yes

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To figure out if (1,2) is a solution to the system, we can plug the values in and see if it is true.

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It is true for this equation. Now let's check the next one.

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Since both equations are true when we plug the values in, (1,2) is a solution to the system.

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x + y = 11

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Step-by-step explanation:

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D but see below.

Step-by-step explanation:

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Usually, you are not allowed to do that. Usually you must be working with whole numbers or rational well behaved fractions.

I think, given the above comment, the answer is D

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