Question

A bag contains 10 red marbles. The ratio of red marbles to blue marbles is 5 to 1. Find the number of blue marbles in the bag.

Answer 1

red:blue=5:1
red/blue=5
red= 10
so blue= 2

Answer 2

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⬇️HERE IS YOUR ANSWER⬇️

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Let the number of red marbles were originally in the bag be x.

Probability Red Marble (originally)

=Number of red marble originally /Total number of marbles originally =1/5

Total number of marbles originally Total number of marbles originally 5x

Now, five more red marbles are added

Total number of marbles 5x5

Number of red marbles x5

Probability (Red marbles) = 1/3

x+5/5x+5 = 1/3

3x+15 = 5x+5

x=5

There were originally 5 red marbles in the bag

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