If v < z, which of the following could be the value of S where 10v/(v + z) + 20z/(v + z) = S and v and z are positive integers?

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What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.