self Maths Puzzle

17) A person sold two cows . each for rs 9900 . if he gained 10% on one and lost 20% on the other , then which of the following is true?
A) He gained rs1500
B) He lost rs 200
C) He lost rs1575
D) None of the above

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self Other Question

16) A car crosses a man walking at 6 km/h. The man can see the things up to 450m only in one direction due to fog. He sees the car which was going in the same direction for 4.5min. What is the speed of the car?
A) 9kmph
B) 12kmph
C) 12.5kmph
D) 15kmph
18) A vessel contains a mixture of two liquids A & B in the ratio 4:1 . when 10liters of the mixture is replaced with liquid B, the ration becomes 2:3. How many liters of liquid A was present in the jar initially?
A) 12 liters
B) 14 liters
C) 16 liters
D) 10 liters