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The Fourth proportional to 12, 14 and 18 is:

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Important Questions on Arithmetic Maths

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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 14
The Proportion of copper and zinc in the brass is 13 : 7. How much zinc will be there be in 100 kg of brass ?
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 15
The ratio of two numbers is 2:3 and the sum of their cubes is 945.The difference of numbers is:
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 16
The ratio of number of ladies to gents at a party was 1 : 2 but when 2 ladies and 2 gents left, the ratio became 1 : 3.How many people were at the party initially? 
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 17
The first three terms of proportion are 3, 9 and 12. The fourth term is:
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 18
A 70 cm long wire is to be cut into two piece so that one piece will be 25th of the other. How many centimeters will the shorter piece be?
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 19
96 is divided into two parts in such a way that seventh part of first and ninth part of second are equal. Find the smaller parts.
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 20
1000 men have provisions for 15 days. If 200 more men join them, for how many days will the provisions last now?
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Police Constables>Chapter 3 - Arithmetic Maths>RATIO-PROPORTION>Q 21
A garrison of 400 men had a provision for 31 days. After 28 days 280 persons reinforcement leaves the garrison. Find the number of days for which the remaining ration will be sufficient.