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A store sells apples at $2/kg and oranges at $5/kg. A customer buys a total of 8 kg paying $25. How many kg of apples?
A3
B4
C5
D6
Answer & Solution
Correct answer: C. 5
Let a = apples (kg), o = oranges (kg). Then a + o = 8 and 2a + 5o = 25. From first: o = 8 - a. Substitute: 2a + 5(8 - a) = 25 → 2a + 40 - 5a = 25 → -3a = -15 → a = 5. So 5 kg apples (3 kg oranges). Check: 2(5) + 5(3) = 10 + 15 = 25 ✓.
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