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Quantitative Aptitude

MIXTURES AND ALLEGATIONS MCQs

Alligations And Mixtures

Total Questions : 245 | Page 23 of 25 pages
Question 221. In two types of brass, the ratios of Copper to Zinc are 8:3 and 15:7 respectively. If the two types of brass be melted and mixed in the ratio 5:2 a new type of brass is obtained. The ratio of Copper to Zinc in this new type of brass is
  1.    3:4
  2.    2:3
  3.    5:2
  4.    3:2
 Discuss Question
Answer: Option C. -> 5:2
Question 222. In what ratio should tea costing Rs 300/kg be mixed with tea costing Rs 200/kg so that the cost of the mixture is Rs 225/kg?
  1.    4 : 1
  2.    3 : 1
  3.    1 : 3
  4.    1 : 4
 Discuss Question
Answer: Option C. -> 1 : 3
Question 223. Two bottles contain acid and water in the ratio 2 : 3 and 1 : 2 respectively. These are mixed in the ratio 1 : 3. What is the ratio of acid and water in the new mixture ?
  1.    7:13
  2.    23:37
  3.    1:3
  4.    11:57
 Discuss Question
Answer: Option A. -> 7:13
Question 224. There are three bottles of mixture of syrup and water of ratios 2:3, 3:4 and 7:5. 10 Litres of first and 21 Litres of second bottles are taken. How much quantity from third bottle is to be taken so that final mixture from three bottles will be of ratios 1:1.
  1.    30 Litres
  2.    35 Litres
  3.    25 Litres
  4.    20 Litres
 Discuss Question
Answer: Option A. -> 30 Litres

Amount of pure milk= a(1 ?b/a)n(n = 3, a = pure milk and b = amount replaced)= 960 (1 ?48/960)^3= 960(1-1/20)^3= 960 * 19/20 * 19/20*19/20= 823.08 lt.


Question 225. An alloy is made by mixing metal A costing Rs 2000/kg and metal B costing Rs 400/kg in the ratio A:B = 3:1. What is the cost (in Rs) of 8 kilograms of this alloy?
  1.    1600
  2.    12800
  3.    6400
  4.    9800
 Discuss Question
Answer: Option B. -> 12800

Amount of pure milk= a(1 ?b/a)n(n = 3, a = pure milk and b = amount replaced)= 960 (1 ?48/960)^3= 960(1-1/20)^3= 960 * 19/20 * 19/20*19/20= 823.08 lt.


Question 226. A drum contains 80 litres of ethanol. 20 litres of this liquid is removed and replaced with water. 20 litres of this mixture is again removed and replaced with water. How much water (in litres) is present in this drum now?
  1.    44
  2.    35
  3.    40
  4.    45
 Discuss Question
Answer: Option B. -> 35

Amount of pure milk= a(1 ?b/a)n(n = 3, a = pure milk and b = amount replaced)= 960 (1 ?48/960)^3= 960(1-1/20)^3= 960 * 19/20 * 19/20*19/20= 823.08 lt.


Question 227. In a container, there is 960 ltr of pure milk from which 48 ltr of milk is replaced with 48 ltr of water, again 48 ltr milk is replaced by same amount of water, as this process is done once more. Now, what is the amount of pure milk?
  1.    821.54 ltr
  2.    719.64 ltr
  3.    823.08 ltr
  4.    901.54 ltr
 Discuss Question
Answer: Option C. -> 823.08 ltr

Amount of pure milk= a(1 ?b/a)n(n = 3, a = pure milk and b = amount replaced)= 960 (1 ?48/960)^3= 960(1-1/20)^3= 960 * 19/20 * 19/20*19/20= 823.08 lt.


Question 228. An alloy contains copper and tin in the ratio 3 : 2. If 250 gm of copper is added to this alloy then the copper in it becomes double the quantity of tin in it. What is the amount (in gm) of tin in the alloy?
  1.    500
  2.    1000
  3.    750
  4.    250
 Discuss Question
Answer: Option A. -> 500

Amount of pure milk= a(1 ?b/a)n(n = 3, a = pure milk and b = amount replaced)= 960 (1 ?48/960)^3= 960(1-1/20)^3= 960 * 19/20 * 19/20*19/20= 823.08 lt.


Question 229. A beaker contains acid and water in the ratio 1 : x. When 300 ml of the mixture and 50 ml of water are mixed, the ratio of acid and water becomes 2 : 5. What is the value of x?
  1.    4
  2.    3
  3.    1
  4.    2
 Discuss Question
Answer: Option D. -> 2
Question 230. In a colored picture of blue and yellow color, blue and yellow color is used in the ratio of 4:3 respectively. If in upper half, blue : yellow is 2:3, then in the lower half blue : yellow is
  1.    1 : 1
  2.    26 : 9
  3.    9 : 26
  4.    2 : 1
 Discuss Question
Answer: Option B. -> 26 : 9

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