Book Maths Puzzle Algebra

If 2/3 of a number is 30, what is 1/3 of twice the number?

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Book Other Question

Henry planned to move 1/3 of his CD collection in the new cabinet in the morning and the rest in the afternoon. If he moved only 2/3 as many as he planned in the morning, what fraction of his CD's were left to be moved in the afternoon? p(x)=-2(x-3)(x-1)^4(x+6), then which of the following is a zero of the polynomial?
a. 2
b. -2
c. 0
d. 3
e. 6