There are n cars in a carpark and 4 more arrive, n+4, 4n, n4, n-4, There are S students in a group and 1 leaves, S + 1, S, S-1, 1S, There are n books in the library and n more are added, n2, n+n, n, 2n, James scores x goals but Mary scores double the goals. How many has Mary scored?, x+2, x, 2x, x+1.

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