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Andru [333]
3 years ago
10

A bag contains only red and blue marbles. Yasmine takes one marble at random from the bag. The probability that she takes a red

marble is 1 in 5. Yasmine returns the marble to the bag and adds five more red marbles to the bag. The probability that she takes one red marble at random is now 1 in 3. How many red marbles were originally in the bag?
Mathematics
2 answers:
strojnjashka [21]3 years ago
8 0
Since the first probability is 1/5, the number of read marbles was either 1 (if there were 5 marbles total), 2 (if there were 10 total), 3 (15 total), 4 (20 total), 5 (25 total), etc.. When you add 5 red marbles to the bag, you are increasing each of those fractions by 5/5. Therefore 1/5 would turn into 6/10 or 3/5. That's not our last probability so we keep going. 2/10 would turn into 7/15. Nope. 3/15 turns into 8/20 or 2/5. Nope. 4/20 turns into 9/25. Nope. 5/25 turns into 10/30 or 1/3. Therefore, the bag started with 5 red marbles out of a total of 25 marbles.
NNADVOKAT [17]3 years ago
4 0
10 10 is the answer i believe
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Yes its right
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7 0
3 years ago
A student charges twenty dollars per hour to type college papers. The student's average typing speed is fifty words per minute.
coldgirl [10]

Answer:

The student should charge $210 for typing the paper ⇒ answer C

Step-by-step explanation:

* Lets explain how to solve the problem

- The rate of the student's typing is 50 words per minute

- The students charges twenty dollars per hour to type the college

 papers

- There is a paper contains 31,500 words

- We want to now how much the student should charge for it

* At first lets find his rate per hour

∵ 1 hour = 60 minutes

∴ 1 minute = 1/60 hours

∵ His rate = 50 words / 1 minute

- Lets change the minute to hour

∴ His rate = 50/(1 × 1/60) = 3000 words per hour

* Lets find the time he needs to finish the paper

∵ The paper contains 31,500 words

∵ Time = The number of words ÷ his rate of typing

∵ his rate is 3000 words per hour

∴ Time = 31,500 ÷ 3000 = 10.5 hours

∴ He needs 10.5 hours to finish the paper

∵ He charges $20 per hour

∵ The time to finish the paper is 10.5 hours

∵ The price of typing the paper = the charge per hour × number

   of hours

∴ The price of typing the paper = 20 × 10.5 = 210

∴ The student should charge $210 for typing the paper

7 0
3 years ago
Read 2 more answers
Lin and Han's families provide money for their school lunch accounts.
Marizza181 [45]

Answer:

1. Lin

2. 3 weeks

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Mary scored 28 points, which is twice as many points as Lashawna scored. Let L represent the points Lashawna scored.
Basile [38]

Answer: Lashawna scored 14 points

Step-by-step explanation:

Let M = Mary's score

L = Lashawna score

M = 28 points

And M is twice as much as L score

M= 2L

L= M/2

L= 28/2

M = 14.

Lashawna score was 14 points

8 0
3 years ago
22. Evaluate -3x+x³ for x = -3​
bekas [8.4K]

Answer:

-18

Step-by-step explanation:

-3x + x³

-3(-3) + (-3)³

9 + (-27)

9 - 27 = -18

3 0
3 years ago
Read 2 more answers
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