If there are 20 marbles in a bag and 1/5 are red, what fraction are red if 1 more red marble is added?

Originally, 1/5 of 20 marbles are red. 1/5 of 20 = 4. If i add 1 more we have 5 red marbles. 5/20 = 1/4.

Answered by Liam O. Maths tutor

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