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What is the next number in this sequence?
2, 6, 18, 54, ___
A bag contains 4 red marbles, 3 blue marbles, and 5 green marbles.
If one marble is picked at random, what is the probability that it is NOT green?
In a class of 24 students, exactly half like maths.
Of those who like maths, one third also play chess.
How many students like maths and play chess?
A rectangle has a perimeter of 30 cm.
Its length is 9 cm.
What is the area of the rectangle?
Tom is 3 times as old as his sister Lily.
In 6 years, Tom will be twice as old as Lily.
How old is Lily now?