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REY [17]
4 years ago
11

An English instructor asserted that​ students' test grades are directly proportional to the amount of time spent studying. Lisa

studies 9 hr for a particular test and gets a score of 72. At this​ rate, how many hours would she have had to study to get a score of 95​?
Mathematics
1 answer:
Nady [450]4 years ago
5 0
\bf \begin{array}{ccll}
hours&score\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
9&72\\
h&95
\end{array}\implies \cfrac{9}{h}=\cfrac{72}{95}\implies \cfrac{9\cdot 95}{72}=h
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Alfred has 10 more tokens than Clarissa. Clarissa has twice as many tokens as Benji. They have 85 tokens altogether. How many to
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Answer:

Alfred has 40 tokens

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Step-by-step explanation:

Let's give each person a variable:

A for Alfred

C for Clarissa

B for Benji

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Alfred has 10 more tokens than Clarissa can look like this:

A = C + 10

Since Alfred has 10 more coins than Clarissa we can take C and add 10 to find how many tokens Alfred has.

Clarissa has twice as many tokens as Benji looks like this:

C = 2B

Since Clarissa has twice as many tokens as Benji we can multiply B (how many tokens Benji has) by 2.

Lastly, they have 85 tokens all together:

A + B + C = 85

We have these 3 equations:

A = C + 10

C = 2B

A + B + C = 85

Now, we can substitute some variables:

A = (2B) + 10    Since C is equal to 2B we can substitute 2B in for C in the first equation.

We have found what A equals, we can plug that in to the last equation:

(2B) + 10 + B + C = 85

We can also substitute the second equation into the third equation:

(2B) + 10 + B + 2B = 85

Combine like terms:

5B + 10 = 85

Solve

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This means that Benji has 15 tokens. Now we can find how much the other children have:

C = 2(15) = 30

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A = 30 + 10

A = 40

Alfred has 40 tokens.

<u>Answer:</u>

Alfred has 40 tokens

Clarissa has 30 tokens

Benji has 15 tokens

<u>Checking the Answer</u>

A + B + C = 85

40 + 15 + 30 = 85

85 = 85

<em>I hope this helps!!</em>

<em>- Kay :)</em>

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