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RBI Grade B Mixture & Alligation Questions with Answers & Explanations

18 Mixture & Alligation questions from the Quantitative Aptitude section of RBI Grade B, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

In what ratio must rice at ₹20/kg be mixed with rice at ₹30/kg so that the mixture costs ₹29/kg?

  1. A2 : 3
  2. B2 : 9
  3. C9 : 1
  4. D1 : 9
  5. E1 : 1
Show answer
Answer: (D) 1 : 9 By alligation, ratio = (30 − 29) : (29 − 20) = 1 : 9.
Question 2

In what ratio must rice at ₹15/kg be mixed with rice at ₹25/kg so that the mixture costs ₹16/kg?

  1. A10 : 1
  2. B3 : 5
  3. C9 : 1
  4. D1 : 9
  5. E1 : 1
Show answer
Answer: (C) 9 : 1 By alligation, ratio = (25 − 16) : (16 − 15) = 9 : 1.
Question 3

In what ratio must rice at ₹24/kg be mixed with rice at ₹36/kg so that the mixture costs ₹26/kg?

  1. A5 : 1
  2. B1 : 1
  3. C1 : 5
  4. D2 : 3
  5. E11 : 2
Show answer
Answer: (A) 5 : 1 By alligation, ratio = (36 − 26) : (26 − 24) = 5 : 1.
Question 4

In what ratio must rice at ₹50/kg be mixed with rice at ₹80/kg so that the mixture costs ₹74/kg?

  1. A1 : 1
  2. B1 : 4
  3. C5 : 8
  4. D4 : 1
  5. E7 : 24
Show answer
Answer: (B) 1 : 4 By alligation, ratio = (80 − 74) : (74 − 50) = 1 : 4.
Question 5

In what ratio must rice at ₹24/kg be mixed with rice at ₹36/kg so that the mixture costs ₹31/kg?

  1. A5 : 7
  2. B7 : 5
  3. C1 : 1
  4. D2 : 3
  5. E6 : 7
Show answer
Answer: (A) 5 : 7 By alligation, ratio = (36 − 31) : (31 − 24) = 5 : 7.
Question 6

In what ratio must rice at ₹30/kg be mixed with rice at ₹45/kg so that the mixture costs ₹39/kg?

  1. A1 : 1
  2. B3 : 2
  3. C7 : 9
  4. D2 : 3
  5. ENone of these
Show answer
Answer: (D) 2 : 3 By alligation, ratio = (45 − 39) : (39 − 30) = 2 : 3.
Question 7

In what ratio must rice at ₹30/kg be mixed with rice at ₹45/kg so that the mixture costs ₹34/kg?

  1. A4 : 11
  2. B11 : 4
  3. C2 : 3
  4. D3 : 1
  5. E1 : 1
Show answer
Answer: (B) 11 : 4 By alligation, ratio = (45 − 34) : (34 − 30) = 11 : 4.
Question 8

In what ratio must rice at ₹30/kg be mixed with rice at ₹45/kg so that the mixture costs ₹35/kg?

  1. A2 : 1
  2. B1 : 2
  3. C11 : 5
  4. D2 : 3
  5. E1 : 1
Show answer
Answer: (A) 2 : 1 By alligation, ratio = (45 − 35) : (35 − 30) = 2 : 1.
Question 9

In what ratio must rice at ₹40/kg be mixed with rice at ₹60/kg so that the mixture costs ₹53/kg?

  1. A13 : 7
  2. B1 : 1
  3. C7 : 13
  4. D2 : 3
  5. E8 : 13
Show answer
Answer: (C) 7 : 13 By alligation, ratio = (60 − 53) : (53 − 40) = 7 : 13.
Question 10

In what ratio must rice at ₹40/kg be mixed with rice at ₹60/kg so that the mixture costs ₹42/kg?

  1. A19 : 2
  2. B9 : 1
  3. C1 : 1
  4. D2 : 3
  5. E1 : 9
Show answer
Answer: (B) 9 : 1 By alligation, ratio = (60 − 42) : (42 − 40) = 9 : 1.

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Question 11

In what ratio must rice at ₹24/kg be mixed with rice at ₹36/kg so that the mixture costs ₹32/kg?

  1. A2 : 3
  2. B2 : 1
  3. C1 : 2
  4. D1 : 1
  5. E5 : 8
Show answer
Answer: (C) 1 : 2 By alligation, ratio = (36 − 32) : (32 − 24) = 1 : 2.
Question 12

In what ratio must rice at ₹40/kg be mixed with rice at ₹60/kg so that the mixture costs ₹41/kg?

  1. A20 : 1
  2. B1 : 1
  3. C1 : 19
  4. D19 : 1
  5. E2 : 3
Show answer
Answer: (D) 19 : 1 By alligation, ratio = (60 − 41) : (41 − 40) = 19 : 1.
Question 13

In what ratio must rice at ₹15/kg be mixed with rice at ₹25/kg so that the mixture costs ₹17/kg?

  1. A1 : 1
  2. B9 : 2
  3. C3 : 5
  4. D1 : 4
  5. E4 : 1
Show answer
Answer: (E) 4 : 1 By alligation, ratio = (25 − 17) : (17 − 15) = 4 : 1.
Question 14

In what ratio must rice at ₹15/kg be mixed with rice at ₹25/kg so that the mixture costs ₹23/kg?

  1. A1 : 4
  2. B3 : 5
  3. C3 : 8
  4. D1 : 1
  5. E4 : 1
Show answer
Answer: (A) 1 : 4 By alligation, ratio = (25 − 23) : (23 − 15) = 1 : 4.
Question 15

In what ratio must rice at ₹40/kg be mixed with rice at ₹60/kg so that the mixture costs ₹55/kg?

  1. A3 : 1
  2. B1 : 1
  3. C1 : 3
  4. D2 : 5
  5. E2 : 3
Show answer
Answer: (C) 1 : 3 By alligation, ratio = (60 − 55) : (55 − 40) = 1 : 3.
Question 16

In what ratio must rice at ₹24/kg be mixed with rice at ₹36/kg so that the mixture costs ₹33/kg?

  1. A1 : 3
  2. B1 : 1
  3. C3 : 1
  4. D2 : 3
  5. E4 : 9
Show answer
Answer: (A) 1 : 3 By alligation, ratio = (36 − 33) : (33 − 24) = 1 : 3.
Question 17

In what ratio must rice at ₹30/kg be mixed with rice at ₹45/kg so that the mixture costs ₹32/kg?

  1. A2 : 3
  2. B1 : 1
  3. C2 : 13
  4. D13 : 2
  5. E7 : 1
Show answer
Answer: (D) 13 : 2 By alligation, ratio = (45 − 32) : (32 − 30) = 13 : 2.
Question 18

In what ratio must rice at ₹24/kg be mixed with rice at ₹36/kg so that the mixture costs ₹28/kg?

  1. A1 : 1
  2. B1 : 2
  3. C2 : 1
  4. D2 : 3
  5. E9 : 4
Show answer
Answer: (C) 2 : 1 By alligation, ratio = (36 − 28) : (28 − 24) = 2 : 1.

These are RankerClub practice questions written in the RBI Grade B pattern. They are not official SSC/IBPS/RRB papers.

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