A company sells product A and product B. Product A's unit price is $20. Product B's unit price is $30. If the total revenue from selling both products was $10,000, how many units of Product A were sold?
✓ Correct Answer: Option C
Let 'a' be units of Product A and 'b' be units of Product B. The equation is 20a + 30b = 10,000. This is one equation with two unknowns. Statement (1) provides 'a+b=X' and Statement (2) provides 'a=Yb'. Either alone isn't enough, but together, they form a system solvable for 'a'.
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