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chubhunter [2.5K]
2 years ago
5

If 40% of the students in the class are boys, and if there are 15 girls in the class, then how many students are in the class? *

1 point
Mathematics
2 answers:
OleMash [197]2 years ago
6 0

Answer:

25

Step-by-step explanation:

15/6.0=2.5

2.5x4=10

2.5x6=15

10+15=25

10 boys and 15 girls

Jet001 [13]2 years ago
6 0

Answer:

25

Step-by-step explanation:

Let's set up "x" as the total number of students. So now we can set up an equation:

40%x+15=x rewritten as:

.4x+15=x Subtract .4x from both sides will give us:

 

15=.6x Now divide each side by .6 to be:

25=x Therefore we know there are 25 students in the class.

Make sense?

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Answer:

To purchase 700 business cards, Jamie needs to pay $43.

Step-by-step explanation:

We are given that Jamie ordered 200 business cards and paid $23 in total.

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\displaystyle \bullet \ \ \ \frac{\triangle y}{\triangle x}

This can also be represented with:

\displaystyle \bullet \ \ \ \frac{y_2-y_1}{x_2-x_1}

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In every relationship, there is a <u>dependent variable</u> and an <u>independent variable</u>.

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We change the amount of business cards that are purchased, which in turn, changes the price.

The y-variable is assigned to the dependent variable and the x-variable is assigned to the dependent variable.

Therefore, if we use the coordinate system:

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Now, we can name our coordinates. We use this system:

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This means that we can name our points:

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Therefore, in order to find the price of 700 business cards, we make x in the equation equal 700 and then solve.

\displaystyle y = \frac{1}{25}(700)+15\\\\y = 28 + 15\\\\y = 43

Therefore, the price of 700 business cards is equal to $43.

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