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A lab technician mixed two salt solutions, Solution A and Solution B. Solution A contained 12% salt, and Solution B contained 4% salt. If the resulting mixture contained 7% salt, how many liters of Solution A were used?
(1) The technician used 20 liters of Solution B.
(2) The resulting mixture was 32 liters.
The OA will be automatically revealed on Thursday 14th of May 2026 07:00:06 PM Pacific Time Zone
(1) The technician used 20 liters of Solution B.
(2) The resulting mixture was 32 liters.
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The OA will be automatically revealed on Thursday 14th of May 2026 07:00:06 PM Pacific Time Zone
ankushsambare
Joined: 13 Jun 2022
Last visit: 13 May 2026
Posts: 121
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Location: India
Schools: ISB '27 Wharton '26 INSEAD Aug '26
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11 May 2026, 20:35
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Let A = liters of Solution A and B = liters of Solution B.
0.12A + 0.04B = 0.07(A + B)
0.12A + 0.04B = 0.07A + 0.07B
0.05A = 0.03B
A/B = 3/5 so A = (3/5)B
(1) B = 20, so A = (3/5) × 20 = 12 → sufficient
(2) A + B = 32, ratio A:B = 3:5 so total 8 parts → each part = 4 → A = 12 → sufficient
Each statement alone is sufficient.
Answer: D
0.12A + 0.04B = 0.07(A + B)
0.12A + 0.04B = 0.07A + 0.07B
0.05A = 0.03B
A/B = 3/5 so A = (3/5)B
(1) B = 20, so A = (3/5) × 20 = 12 → sufficient
(2) A + B = 32, ratio A:B = 3:5 so total 8 parts → each part = 4 → A = 12 → sufficient
Each statement alone is sufficient.
Answer: D
12 May 2026, 04:43
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Through alligation, Va:Vb=3:5
Statement 1. B=20
3/5=Va/20, Va=60/5, Va= 12 litre
Hence statement 1 is sufficient
Statement 2. Resultant Mixture= 32
which is in the ratio 3:5
so, 3k+5k=8k
8k=32, k= 4
Solution A is 3k, so 3x4 =12 litre
Hence statement 2 is sufficient
Answer will be D
Statement 1. B=20
3/5=Va/20, Va=60/5, Va= 12 litre
Hence statement 1 is sufficient
Statement 2. Resultant Mixture= 32
which is in the ratio 3:5
so, 3k+5k=8k
8k=32, k= 4
Solution A is 3k, so 3x4 =12 litre
Hence statement 2 is sufficient
Answer will be D
