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
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
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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