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practice questions

30. Marbles

There is a blue jar, a purple jar and a green jar, sitting in a row in her room.Until yesterday there were twice as many marbles in the green jar, than in the purple jar. This morning, Jenny removed 3 marbles from the middle jar and gave them to a friend as a gift. She then removed half of the remaining marbles from the middle jar and placed them into the blue jar. What color is the middle jar?

It's not the blue jar, since marbles were taken from the middle
jar and placed into the blue jar. This leaves purple and green.

Only an even number of marbles can be split in half.

After removing 3 marbles, the remaining marbles
must be capable of being split into half (even number).

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