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2 years ago

Chyna is taking a test. she completed 15 questions which is 25%. How many total questions are

Mathematics

2 answers:

lyudmila [28]2 years ago

8 0

Answer:

Step-by-step explanation:

Chyna is taking a test, for now, she has completed 15 questions. The amount of questions she completed in percentage is 25%. The question is asking how many questions are on the test, so first we need to find how we can get 25% to 100%, then what we did for that to happen we would also apply it to the 15 questions Chyna has already taken.

So 25% multiplied by 4 equals 100%.

Therefore meaning that we need to multiply 4 by 15 to get our answer.

15 * 4

This means that the test has 60 questions in total.

Crank2 years ago

3 0

Answer:

60 questions

Step-by-step explanation:

Divide: 100% divided by 25%=4

Multiply: 15*4=60

60 questions

Hope this helped!! :)

Stay safe and have a wonderful day/night!!!!!

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Given:

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$\begin{gathered} 2\log _3x-\log _3(x-2)=2 \\ \log _3x^2-\log _3(x-2)=2_{}\text{ \lbrack{}log(a)-log(b) = log(a/b)\rbrack} \\ \log _3\lbrack\frac{x^2}{x-2}\rbrack=2 \end{gathered}$

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$\begin{gathered} \log _3\lbrack\frac{x^2}{x-2}\rbrack=2 \\ \frac{x^2}{x-2}=3^2 \\ x^2=9(x-2) \\ x^2-9x+18=0 \end{gathered}$

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$\begin{gathered} x^2-6x-3x+18=0 \\ x(x-6)-3(x-6)=0 \\ (x-6)(x-3)=0 \end{gathered}$

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$\begin{gathered} x-3=0 \\ x=3 \end{gathered}$

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$\begin{gathered} 2\log _3(3^{})-\log _3(3-2)=2 \\ 2\log _33-\log _31=2 \\ 2\cdot1-0=2 \\ 2=2 \end{gathered}$

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$\begin{gathered} 2\log _36-\log _3(6-2)=2 \\ 2\log _36-\log _34=2 \\ \log _3(6^2)-\log _34=2 \\ \log _3(\frac{36}{4})=2 \\ \log _39=2 \\ \log _3(3^2)=2 \\ 2\log _33=2 \\ 2=2 \end{gathered}$

Equation satifies for x = 6.

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