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15 Mixtures Questions and Answers

15 solved Mixtures questions with step-by-step explanations. Includes formulas, shortcuts, and tips for placement tests and competitive exams.

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Q1 Easy

A 50 L vessel is full of milk. 10 L milk is removed and replaced with water. What is milk percentage now?

  • A. 72
  • B. 80 ✓
  • C. 76
  • D. 84
Explanation: Milk left = 40 L out of 50 L. Milk % = 40/50 x 100 = 80%.
Q2 Easy

Mix 9 L of 50% acid solution with 9 L of 70% solution. Find final acid percentage.

  • A. 54
  • B. 60 ✓
  • C. 64
  • D. 56
Explanation: Final % = (9x50+9x70)/(18) = 60%.
Q3 Easy

A 40 L vessel is full of milk. 20 L milk is removed and replaced with water. What is milk percentage now?

  • A. 42
  • B. 50 ✓
  • C. 46
  • D. 54
Explanation: Milk left = 20 L out of 40 L. Milk % = 20/40 x 100 = 50%.
Q4 Easy

Mix 14 L of 50% acid solution with 6 L of 70% solution. Find final acid percentage.

  • A. 56 ✓
  • B. 60
  • C. 50
  • D. 52
Explanation: Final % = (14x50+6x70)/(20) = 56%.
Q5 Easy

A 20 L vessel is full of milk. 10 L milk is removed and replaced with water. What is milk percentage now?

  • A. 54
  • B. 46
  • C. 42
  • D. 50 ✓
Explanation: Milk left = 10 L out of 20 L. Milk % = 10/20 x 100 = 50%.
Q6 Easy

Mix 9 L of 40% acid solution with 15 L of 80% solution. Find final acid percentage.

  • A. 69
  • B. 61
  • C. 65 ✓
  • D. 59
Explanation: Final % = (9x40+15x80)/(24) = 65%.
Q7 Medium

A 30 L vessel is full of milk. 15 L milk is removed and replaced with water. What is milk percentage now?

  • A. 46
  • B. 50 ✓
  • C. 54
  • D. 42
Explanation: Milk left = 15 L out of 30 L. Milk % = 15/30 x 100 = 50%.
Q8 Medium

Mix 14 L of 40% acid solution with 6 L of 80% solution. Find final acid percentage.

  • A. 56
  • B. 48
  • C. 46
  • D. 52 ✓
Explanation: Final % = (14x40+6x80)/(20) = 52%.
Q9 Medium

A shopkeeper mixes 14 kg tea at Rs. 38/kg with 14 kg tea at Rs. 100/kg. What is average cost per kg?

  • A. 66
  • B. 69 ✓
  • C. 72
  • D. 63
Explanation: Average cost = (14x38+14x100)/(28) = 69.
Q10 Medium

A 25 L vessel is full of milk. 20 L milk is removed and replaced with water. What is milk percentage now?

  • A. 20 ✓
  • B. 16
  • C. 24
  • D. 12
Explanation: Milk left = 5 L out of 25 L. Milk % = 5/25 x 100 = 20%.
Q11 Medium

A shopkeeper mixes 9 kg tea at Rs. 38/kg with 13 kg tea at Rs. 148/kg. What is average cost per kg?

  • A. 97
  • B. 100
  • C. 103 ✓
  • D. 106
Explanation: Average cost = (9x38+13x148)/(22) = 103.
Q12 Hard

A 25 L vessel is full of milk. 5 L milk is removed and replaced with water. What is milk percentage now?

  • A. 72
  • B. 80 ✓
  • C. 84
  • D. 76
Explanation: Milk left = 20 L out of 25 L. Milk % = 20/25 x 100 = 80%.
Q13 Hard

A shopkeeper mixes 5 kg tea at Rs. 65/kg with 10 kg tea at Rs. 137/kg. What is average cost per kg?

  • A. 107
  • B. 116
  • C. 113 ✓
  • D. 110
Explanation: Average cost = (5x65+10x137)/(15) = 113.
Q14 Hard

A 25 L vessel is full of milk. 10 L milk is removed and replaced with water. What is milk percentage now?

  • A. 52
  • B. 64
  • C. 56
  • D. 60 ✓
Explanation: Milk left = 15 L out of 25 L. Milk % = 15/25 x 100 = 60%.
Q15 Hard

A shopkeeper mixes 13 kg tea at Rs. 73/kg with 7 kg tea at Rs. 133/kg. What is average cost per kg?

  • A. 97
  • B. 88
  • C. 91
  • D. 94 ✓
Explanation: Average cost = (13x73+7x133)/(20) = 94.

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