Selected MCQ

Current Question
In what ratio should water be mixed with spirit to gain 20%?
  • A. 2:5
  • B. 1:5
  • C. 3:5
  • D. 4:5
Correct Answer: B
Explanation:
The profit method yields a 1:5 ratio.
Related Question 1
Vessel P contains 62.5% alcohol, and Q contains 87.5%. If 2 L from P and 4 L from Q are mixed, find ratio of alcohol to water ____.
  • A. 16: 5
  • B. 14: 5
  • C. 16: 7
  • D. 19: 5
Correct Answer: D
Explanation:
Calculate the alcohol content and compare it with water.
Related Question 2
Wheat costing Rs. 9/kg and Rs. 15/kg are mixed in ratio 3: 7. What is the cost price per kg of mixture ____.
  • A. Rs. 13.50
  • B. Rs. 14.50
  • C. Rs. 15.50
  • D. Rs. 16.50
Correct Answer: D
Explanation:
Weighted average = (3×9+7×15)/10.
Related Question 3
Three men walk around a circular track of 11 km. Find a time for them to meet again.
  • A. 11 hours
  • B. 12 hours
  • C. 220 hours
  • D. 22 hours
Correct Answer: A
Explanation:
LCM of time intervals.
Related Question 4
Wheels with revolutions 15, 20 and 48 meet again after ____.
  • A. 1 min
  • B. 2 min
  • C. 3 min
  • D. None
Correct Answer: A
Explanation:
LCM concept.
Related Question 5
Ratio of speed of boat to stream is 36:5. Time downstream is 5h 10min. Find upstream time.
  • A. 5h 50m
  • B. 6h
  • C. 6h 50m
  • D. 12h 10m
Correct Answer: C
Explanation:
Use the ratio method for speeds.