A bag contains 10 red marbles and 15 green marbles.If Yuki selects a marble from the bag without looking, what is the probability that she will pull a red marble?

A-1/5

B-2/5

C-1/2

Answer:

The probability of pulling a red marble is $\frac{2}{5}$

Step-by-step explanation:

Given

Red Marble = 10

Green Marble = 15

Required

The probability of picking a red marble

First, the total number of marble has to be calculated

Total = Red Marble + Green Marble

Total = 10 marbles + 15 marbles

Total = 25 marbles

The probability of an event is often calculated by dividing the number of required outcomes by the number of possible outcomes.

In this case, the probability of pulling a red marble is calculated as follows:

$P(R) = \frac{n(R)}{T}$

Where P(R) represents probability of pulling a red marble

n(R) represents number of red marbles

n(R) = 10

T represents total number of marbles

T = 25

By substitution,

$P(R) = \frac{n(R)}{T}$ becomes

$P(R) = \frac{10}{25}$

Reduce fraction to lowest term by dividing the numerator and denominator by 5

$P(R) = \frac{2}{5}$

Hence, the probability of pulling a red marble is $\frac{2}{5}$

7 0

3 years ago

Brenna ran a total of 8 miles over the course of 4 track practices. How many track practices would it take for Brenna to run 16

solong [7]

Answer:

8 in total

Step-by-step explanation:

8 miles in 4 track practices, that's 2 miles every practice, you just multiply or add. She needs 4 more track practices because 8 x 2 is 16, which is how many miles she runs every practice. If you put 4 more practices it would be 16 miles and 8 practices in total. Sorry if this didn't make sense or confused you, I'm not the best at explaining but you're answer for the total amount of practices is 8.

6 0

3 years ago