around 2/5 a jar of marbles
full jar of marbles
take away 3/4 leaves 1/4 in jar
kayla returned 1/3 to the jar
now the jar has 1/4 + 1/3
common denominator 12
1/4 * 3/3 + 1/3 * 4/4
3/12 + 4/12 = 7/12
The jar is 7/12 full
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