Question

There is a bag with only red marbles and blue marbles.

The probability of randomly choosing a red marble is 3/7
There are 12 red marbles in the bag and each is equally likely to be chosen.
Work out how many marbles in total there must be.

Answer 1

28 marbles

Explanation:

"x" total number:

`x=(12)/((3)/(7) ) =((12)(7))/(3) =(84)/(3) =28`

hope its help you