Mixture and Alligation (Railway Maths) (Part – I)

Total Questions: 50

11. Manganese and aluminium are mixed in the ratio of 2 : 3 to make an alloy. The quantity (in kg) of aluminium required to be melted with 24 kg of manganese is_________. [Group D 14/09/2022 (Morning) ]

Correct Answer: (a) 36
Solution:

12. If a milkman adds 4 liter of water to 9 liter of milk, then the amount of water he should add to 36 liter of milk in order to maintain the same proportion of milk and water will be: [Group D 18/09/2022 (Afternoon) ]

Correct Answer: (a) 16ℓ
Solution:

13. 6 kg of ₹48 per kg rice is mixed with 3 kg of another variety of rice to get a mixture costing ₹60 per kg. What is the price per kg of another variety rice in the mixture? [Group D 30/09/2022 (Afternoon) ]

Correct Answer: (c) ₹84
Solution:

14. 2 litres of liquid having milk and water in the ratio 3 : 2 is mixed with 3 liters of liquid having milk and water in the ratio 2 : 3. Find the ratio of milk to water in the new mixture. [Level 5 (12/06/2022) Shift 1 ]

Correct Answer: (c) 12 : 13
Solution:

15. How much water should be added to 90 ml of a 38% sugar solution so that it becomes a 17.1% sugar solution ? [Level 2 (13/06/2022) Shift 1 ]

Correct Answer: (a) 110 ml
Solution:

16. A certain quantity of a 35% sugar solution is mixed with the 8 litres of a 48% sugar solution to obtain a 40% sugar solution. How many litres of the 35% sugar solution was there in the mixture ? [Level 5 (15/06/2022) Shift 1 ]

Correct Answer: (a) 12.8
Solution:

17. In a blend of apple juice and orange juice, 20% was apple juice. In another blend of the two juices, 30% was orange juice. The two blends are mixed in a certain ratio so that the ratio of apple juice and orange juice in the mixture was 4 : 3. Find the ratio of the first blend and the second blend in that order, in the final mixture. [Level 5 (15/06/2022) Shift 3 ]

Correct Answer: (b) 9 : 26
Solution:

18. In a stock of two products A and B initially 80% of the total stock was product A. If 20 kg of product A and 8 kg of product B were taken out from the stock, then the ratio of the product A to product B in the stock changed to 9 : 2. What was the total stock (in kg) in the beginning ? [Level 3 (17/06/2022) Shift 2 ]

Correct Answer: (d) 160 kg
Solution:

19. From 10 litres of a solution 2 litres of water evaporated. The remaining solution was found to have 6% salt. What was the percentage of salt in the original solution? [RRB NTPC 29/12/2020 (Evening) ]

Correct Answer: (d) 4.8%
Solution:

20. A metallic part of a machine is made from a mixture of copper, zinc and lead mixed in the ratio of 13 : 6 : 1. If the weight of zinc in this part is 90 kg, then the total weight of the part will be [RRB NTPC 30/12/2020 (Morning) ]

Correct Answer: (c) 300 kg
Solution: