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A number z lies between 0 and 1. Which of the following is true?

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Important Questions on Ratio, Proportion and Variation

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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 28
₹1200 is divided among three friends, Amit, Bineet and Chaman in such a way that 13 of Amit's share, 14 of Bineet's share and 15 of Chaman's share are equal. Find Amit's share.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 29
After an increment of 5 in both numerator and denominator, a fraction changes to 67. Find the original fraction.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 30
The difference between two positive numbers is 11 and the ratio between them is 2:1. Find the product of the two numbers.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 31
If 10 tractors can plough 16 of a field in 12 days, how many days will 20 tractors take to plough the remaining field? 
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 32
A cow takes 5 leaps for every 4 leaps of a goat, but 3 leaps of the goat are equal to 4 leaps of the cow. What is the ratio of the speed of the cow to that of the goat?
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 33
The present ratio of ages of P and Q is 3:5. 10 years ago, this ratio was 1:2. Find the sum total of their present ages.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 34
Four numbers in the ratio 1:2:4:8 add up to give a sum of 120. Find the value of the biggest number.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 11 - Ratio, Proportion and Variation>Level of Difficulty>Q 35
Three men rent a farm for ₹14000 per annum. A puts 220 cows in the farm for 3 months, B puts 220 cows for 6 months and C puts 880 cows for 3 months. What percentage of the total expenditure should C pay?