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Nonamiya [84]
3 years ago
7

Kyra observed that 85% of the students at the library like to read mystery stories. If 30 students at the library did not like r

eading mystery stories, the number of students at the library who like mystery stories was _____. (Only numeric values, no other symbols)
Mathematics
1 answer:
Kisachek [45]3 years ago
7 0
Set this up as a proportion. If 85% of students like to read mysteries, that means that 15% don't. Therefore, if 30 students don't like mysteries, then 30 students account for 15% of the total number of students.  Set it up as a ratio where 30 students = 15% and  X students = 85%. Of course in order to use percentages in an equation we have to change them to decimals, .15 and .85 respectively. Then set up the ratio keeping the number of students in alignment and then the percentage of students in alignment (cuz % is not the same as the number of students.)  Like this:
\frac{students}{percent}: \frac{30}{.15} = \frac{x}{.85}
Now we cross-multiply to get .15x = 25.5 and x = 170.  That means that 170 students like to read mysteries and that also means that 170 accounts for 85% of the total number of students (which is 200).
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<em>Additional comment</em>

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3 years ago
Jamie and Stella are saving money to sign up for a school trip to Washington, D.C. In order to sign up for the trip, they must p
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  •    Part 1: 25x ≥ 600
  •    Part 2: 15y ≥ 600
  •    Part 3: y ≤ 40

Explanation:

Verbal statements must be translated into algebraic expressions, equations or inequalities.

<u>1. Money earned by Jamie washing cars for $25 each</u>

   Let x represent the number of cars Jaime washes.

  •    25x

<u>2. Money earned by Stella  making pecan pies for $15 each</u>

   Let y represent the number of pies she makes

  •    15y

<u>3. Constraint on the number of pies that Stella can make because she only has enough supplies to make 40 pies</u>.

Write an inequality using the symbol ≤, since y can take any integer value up to 40.

  •    y ≤ 40

4. First question:

Part 1: Write a constraint (an inequality) to represent how much money Jamie needs for his trip

  •    25x ≥ 600

5. Second question:

Part 2: Write a constraint (an inequality) to represent how much money Stella needs for her trip.

  •    15y ≥ 600

6. Third question

Part 3: Write a constraint (an inequality) to represent the limitations of Stella's supplies.

From step # 3

  •    y ≤ 40

7. Conclusion

You can solve the inequalities fo find whether Stella can or not afford the trip:

Solve for the inequalities that represent Stella's situation:

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  •    y ≥ 600 / 15
  •    y ≥ 40
  •    From step 6: y ≤ 40

The solution set is the intersection of the two solutions:

  • y ≥ 40 ∩ y ≤ = 40 = 40.

  • Interpretation: Stella will be able to make 40 pies, which represents a revenue of $ 15 / pie × 40 pie = $ 600, so she will be able to make the trip.

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