10
Answer: BSet 3: Ratios Rates Proportions (Advanced)
Explanation
PROBLEM
A mixture is made of two substances in the ratio 2:5. If the total mixture is 42 liters, how many liters is the first substance?
A mixture is made of two substances in the ratio 2:5. If the total mixture is 42 liters, how many liters is the first substance?
A.
9
B.✓ Correct
12
C.
10
D.
6
Detailed Explanation
Choice B is the best answer. First substance = 2/(2+5) times 42 = 2/7 times 42 = 12 liters
Why others are wrong:
A: 9 is incorrect because it does not satisfy the equation.
C: 10 is incorrect because it does not satisfy the equation.
D: 6 is incorrect because it does not satisfy the equation.
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