Question

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

The probability of randomly choosing a red marble is
7
8
.
There are 56 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

Explanation:

Multiply 56 by 7/8 to determine the amount of red marbles.

*56 can be put over 1.

Multiply;

`(56)/(1) * (7)/(8) = (392)/(8)`

Simplify by dividing by 8;

`(392 / 8)/(8 / 8) = (49)/(1)`

There are 49 red marbles.