Question

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 7 9 . There are 63 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

Answer 1

Step-by-step explanation:

63/78

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Answer 2

Given:

• a bag with only red marbles and blue marbles.
• There are 63 marbles in total in the bag
• The probability of randomly choosing a red marble is 7/9.

To Find:

The no. red marbles in the bag.

Solution:

Probability = no of favorable events/ total no of events

in this case,

probability of red marble = no of red marbles / total no of marbles

7/9 = no of red marbles / 63

7 × 63 / 9 = no of red marbles

49 = no of red marbles

Hence, the no. red marbles in the bag are 49.