Delhi Police Constable • DP Maths
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Chapter

Mixture & Alligation / मिश्रण व मिलावट

High-frequency mixture & alligation patterns: concentration, replacement, price-weight mixture.

Smart Tips / आसान ट्रिक्स

  • Alligation rule: Qty(lower):Qty(higher) = (Higher - Mean):(Mean - Lower).
  • Replacement में removed quantity = added quantity (same).
  • If water is added to milk: milk quantity same, total increases.
  • Concentration = (Pure / Total) × 100.
  • Ratio method fast है—long equations avoid करो.

Formula / Key Notes

1) Concentration (%) = (Pure quantity / Total quantity) × 100

2) Alligation:
Mix A% (lower) & B% (higher) to get M%:
Ratio (A : B) = (B - M) : (M - A)

3) Replacement:
New pure = Old pure - removed pure + added pure
(If added is water, added pure = 0)

How to Score More

Practice 10 questions below. Click Show Answer only after you attempt.

Exam tip: units + totals पहले देखो, फिर calculation.

Practice Questions (10)

Q1. Mix 30% and 50% solutions to get 40%. Ratio is:
Q2. A 20L mixture has milk:water = 3:2. How much milk?
Q3. In 25L mixture, water is 40%. Water quantity is:
Q4. A container has 30L milk. 6L is removed and replaced by water. Milk left is:
Q5. After that replacement, milk % becomes:
Q6. Mix 10kg at ₹20/kg with 5kg at ₹30/kg. Mean price is:
Q7. Two types of rice ₹40 and ₹60 to get ₹45. Ratio (₹40:₹60):
Q8. A 12% salt solution and 20% salt solution are mixed to get 16%. Ratio is:
Q9. In a 10L mixture, alcohol is 30%. How much alcohol?
Q10. A mixture has 60% milk. If 5L water is added to 20L mixture, new milk % is:
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