Question

There are only red counters, blue counters and purple counters in a bag.

The ratio of the number of red counters to the number of blue counters is 3 : 17

Sam takes at random a counter from the bag.

The probability that the
counter is purple is 0.2

Work out the probability that Sam takes a red counter.

Answer 1

0.15

Explanation:

R:B:P

3:17:4

20x0.2=4

0.2/4=0.05

P(R)= 0.05x3

P(R)=0.15