1. In a mixture of milk and water the proportion of water by weight was 75%. If in the 60 gms mixture 15 gms water was added, what would be the percentage of water in the new mixture ?
(1) 75%
(2) 88%
(3) 90%
(4) 100%
(5) None of these
2. In 1kg mixture of sand and iron, 20% is iron. How much sand should be added, so that the proportion of iron becomes 5% ?
(1) 3 kg
(2) 4 gms
(3) 5 gms
(4) 6 kg
(5) None of these
3. The wheat sold by a grocer contained 10% low quality wheat. What quantity of good quality wheat should be added to 150 kgs of wheat so that the percentage of low quality wheat becomes 5% ?
(1) 150 kgs
(2) 135 kgs
(3) 50 kgs
(4) 85 kgs
(5) None of these
4. A grocer purchased 2 kg. of rice at the rate of Rs. 15 per kg. and 3 kg. of rice at the rate of Rs. 13 per kg. At what price per kg should he sell the mixture to earn 33(1/3)% profit on the cost price ?
(1) Rs. 28.00
(2) Rs. 20.00
(3) Rs. 18.40
(4) Rs. 17.40
(5) None of these
5. Two barrels contain a mixture of ethanol and gasoline. The content of the ethanol is 60% in the first barrel and 30% in the second barrel. In what ratio must the mixtures from the first and the second barrels be taken to form a mixture containing 50% ethanol ?
(1) 1 : 2
(2) 2 : 1
(3) 2 : 3
(4) 3 : 2
(5) None of these
6. To x litres of an x% solution of acid, y litres of water is added to get (x -10)% solution of acid. If x > 20, then value of y is
(1) x^2/100
(2) 10x/x-10
(3) 10/x+10
(4) 10x^2/x-10
(5) None of these
7. A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, the ratio of gold and copper in C will be :
(1) 5 : 7
(2) 5 : 9
(3) 7 : 5
(4) 9 : 5
(5) None of these
8. A container has 30 litres of water. If 3 litres of water is replaced by 3 litres of spirit and this operation is repeated twice, what will be the quantity of water in the new mixture ?
(1) 24 litres
(2) 23 litres
(3) 24.3 litres
(4) 23.3 litres
(5) None of these
Answers :)
1. 5
2. 1
3. 1
4. 3
5. 2
6. 2
7. 3
8. 3
(1) 75%
(2) 88%
(3) 90%
(4) 100%
(5) None of these
2. In 1kg mixture of sand and iron, 20% is iron. How much sand should be added, so that the proportion of iron becomes 5% ?
(1) 3 kg
(2) 4 gms
(3) 5 gms
(4) 6 kg
(5) None of these
3. The wheat sold by a grocer contained 10% low quality wheat. What quantity of good quality wheat should be added to 150 kgs of wheat so that the percentage of low quality wheat becomes 5% ?
(1) 150 kgs
(2) 135 kgs
(3) 50 kgs
(4) 85 kgs
(5) None of these
4. A grocer purchased 2 kg. of rice at the rate of Rs. 15 per kg. and 3 kg. of rice at the rate of Rs. 13 per kg. At what price per kg should he sell the mixture to earn 33(1/3)% profit on the cost price ?
(1) Rs. 28.00
(2) Rs. 20.00
(3) Rs. 18.40
(4) Rs. 17.40
(5) None of these
5. Two barrels contain a mixture of ethanol and gasoline. The content of the ethanol is 60% in the first barrel and 30% in the second barrel. In what ratio must the mixtures from the first and the second barrels be taken to form a mixture containing 50% ethanol ?
(1) 1 : 2
(2) 2 : 1
(3) 2 : 3
(4) 3 : 2
(5) None of these
6. To x litres of an x% solution of acid, y litres of water is added to get (x -10)% solution of acid. If x > 20, then value of y is
(1) x^2/100
(2) 10x/x-10
(3) 10/x+10
(4) 10x^2/x-10
(5) None of these
7. A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, the ratio of gold and copper in C will be :
(1) 5 : 7
(2) 5 : 9
(3) 7 : 5
(4) 9 : 5
(5) None of these
8. A container has 30 litres of water. If 3 litres of water is replaced by 3 litres of spirit and this operation is repeated twice, what will be the quantity of water in the new mixture ?
(1) 24 litres
(2) 23 litres
(3) 24.3 litres
(4) 23.3 litres
(5) None of these
Answers :)
1. 5
2. 1
3. 1
4. 3
5. 2
6. 2
7. 3
8. 3
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