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How many numbers are there between 500 and 600 in which 9 occurs only once?

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Important Questions on Number System

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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 20
Replace the * in the number 6 * 106 by a suitable digit so that the number formed is exactly divisible by 11.
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 21
The value of 101+102+103+….+200 is:
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 22
What are the values of 'a' and 'b', if 4266 ab is divisible by 45 ?
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 23
The digit in the unit's place of the number 171999+111999-71999 is:
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 24
The number, one less than 719 is divisible by:
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 25
If a number is divided by the other number, the division is 35. If their difference is 28, what is the bigger number of the two?
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 26
A,B,C,D and E are five consecutive even numbers, If sum of A and B is 162, what is the sum of all the numbers?
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Quantitative Aptitude for Competitive Examinations>Chapter 1 - Number System>Practice Problems Level 1>Q 27
A certain number of pieces of an article are to be packed in boxes, such that each box contains 145 pieces. If after packing them in 32 boxes, 25 pieces are left out, what was the number of pieces to be packed?