Question

24 pens are there in a box where 10 are red pens, ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blue pen is 0.25. Find the ratio of the number of blue pens and black pens.

A 5:2 Correct Answer Incorrect Answer
B 3:4 Correct Answer Incorrect Answer
C 17:7 Correct Answer Incorrect Answer
D 7:1 Correct Answer Incorrect Answer

Solution

Probability of getting a blue  pen , => p/24 = 1/4 => p = 6 So, number of black  pens  = 24 – 10 – 6 = 8 Required ratio = 6 : 8 = 3:4 

Practice Next

Relevant for Exams:

×
×