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Practice Questions

:- You can add tough questions into
your favourite list for second revision. Note |

Q6. | A jar full of whiskey contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohols and now the percentage of alcohol was found to be 26%. The quantity of whisky replaced of whisky replaced is : | ||||||||||||||||

A. | ^{1}/_{3} |
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B. | ^{2}/_{3} |
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C. | ^{2}/_{5} |
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D. | ^{3}/_{5} |
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View Answer
Explanation:-
Answer : BDiscuss it below :By the rule of alligation we have :
so, required quantity replaced = ^{2}/_{3}Click here for more comments |

Q7. | One quality of wheat at Rs 9.30 per kg is mixed with another quality at a certain rate in the ratio 8 : 7. If the mixture so formed be worth Rs. 10 per kg. what is the rate pre kg of the second quality of wheat ? | ||||||||||||||||

A. | Rs. 10.30 [Wrong Answer] | ||||||||||||||||

B. | Rs. 10.60 [Wrong Answer] | ||||||||||||||||

C. | Rs. 10.80 [Correct Answer] | ||||||||||||||||

D. | Rs. 11 [Wrong Answer] | ||||||||||||||||

View Answer
Explanation:-
Answer : CDiscuss it below :Let the rate of the second quantity be Rs. x per kgBy the rule of alligation we have :
^{100x - 1000}/_{70}^{8}/_{7}700x - 7000 = 560 700x 7560 x = Rs.10.80 Click here for more comments |

Q8. | In what ratio must water be mixed with milk to gain 16 ^{2}/_{3} | ||||||||||||||||

A. | 1 : 6 [Correct Answer] | ||||||||||||||||

B. | 6 : 1 [Wrong Answer] | ||||||||||||||||

C. | 2 : 3 [Wrong Answer] | ||||||||||||||||

D. | 4 : 3 [Wrong Answer] | ||||||||||||||||

View Answer
Explanation:-
Answer : ADiscuss it below :Let C.P. of 1 litre milk be Re. 1.S.P. of 1 litre of mixture = Re. 1, Gain ^{50}/_{3}so C.P. of 1 litre of mixture = ^{3}/_{350}^{6}/_{7}By the rule of alligation, we have :
^{1}/_{7}^{6}/_{7}Click here for more comments |

Q9. | A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container. |

A. | 26.34 litres [Wrong Answer] |

B. | 27.36 litres [Wrong Answer] |

C. | 28 litres [Wrong Answer] |

D. | 29.16 litres [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss it below :Amount of milk left after 3 operations= ^{4}/_{}^{3}= ^{9}/_{10} x ^{9}/_{10} x ^{9}/_{10}= 29.16 liters DJ Said on 2015-08-09 03:39:56Very important question I have already face it in many exams DJ Said on 2015-08-09 03:37:46=(x(1-y/x)^3) Click here for more comments |

Q10. | A dishonest milkman professes to sell his malt at cost price but he mixes it with water and thereby gains 25%, the percentage of water in the mixture is : | ||||||||||||||||

A. | 4% [Wrong Answer] | ||||||||||||||||

B. | 6.25% [Wrong Answer] | ||||||||||||||||

C. | 20% [Correct Answer] | ||||||||||||||||

D. | 25% [Wrong Answer] | ||||||||||||||||

View Answer
Explanation:-
Answer : CDiscuss it below :Let C.P. of 1 litre milk be Re. 1.Then, S.P. of 1 litre of mixture = Re. 1, Gain = 25%. C.P. of 1 litre ,mixture = Re. ^{100 x 1}/_{125}^{4}/_{5}
^{4}/_{5}^{1}/_{5}Hence, percentage of water in the mixture = ^{1}/_{5}^{ x 100}= 20% Click here for more comments |

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