Math, asked by chayashemane6, 6 hours ago

Q5) The ratio of black pens to blue pens in a box is 2:5. (2M) (a) What fraction of pens are blue? (b) What is the percentage of black pens in the box?​

Answers

Answered by omugale15
0

Answer:

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Step-by-step explanation:

Correct option is

B

14

1

Total Blue Pens: 4

Total Red Pens: 2

Total Black Pens: 3

Total Pens: 4+2+3=9

Probability of drawing 2 blue pens =

9

C

2

4

C

2

=

9×8

4×3

=

6

1

After this, the pens are not replaced, which reduces the number of pens in the pack to 7.

So, the probability of drawing 1 black pen from a pack of 7 pens would be

7

C

1

3

C

1

=

7

3

Probability of drawing 2 blue pens and 1 black pen =

6

1

×

7

3

=

14

1

.

Answered by gaminglinda271
0

Step-by-step explanation:

Black pens - 5x and blue pens = 8x.

5x:(8x-20) = 5:6, or

30x = 40x-100

10x = 100, or

x = 10

So there were 50 black pens and 80 blue pens to start with.

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