Question

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

The probability of randomly choosing a red marble is
7/10

There are 42 red marbles in the bag and each is equally likely to be chosen.
How many marbles in total must there be?

Answer 1

There are 60 marbles in the bag

Explanation:

The total number of marbles times the probability of red marbles = number of red marbles

total * 7/10 = 42

Multiply each side by 10/7

total * 7/10 * 10/7 = 42*10/7

total

60

There are 60 marbles in the bag