Question

if a bag contain 40 marble,and you have a 1/10 chance of picking a red marbles .how many red marble are in the bag?
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Answer 1

Probability = 1/10

We know,

Probability = Red marbles / Total marbles.

Let red marbles be 'x'.

$\frac{1}{10} = \frac{x}{40} \\ \\ x = 4$

There are 4 red marbles in the bag.

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Answer 2

Given:

Total number of marbles = 40

Chance of picking red marbles = 10

To Find:

The total number of red marbles in the bag

Solution:

Let the number of red marbles be = x

Using the formula of probability -

Probability = Total number of red marbles / Total number of marbles.

Thus, as per the question, the equation will be -  

= 1/10 = x/40

x = 40/10

= 4

Answer: There are a total of 4 red marbles in the bag.