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A bag contains 25 paise, 50 paise and Rs 1 coins. There are 220 coins in all and the total amount in the bag is Rs 160. If there are thrice as many 1 Re. coins as there are 25 paise coins, then what is the number of 50paise coins?

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Important Questions on Number Systems

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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems

The sum of three consecutive numbers is 126. Find the highest number-

1. 41
2. 42
3. 43
4. 44

HARD
Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
For a real number r we denote by r the largest integer less than or equal to r. If x, y are real numbers with x, y ≥1 then which of the following statements is always true?
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How many times does the number 3 occur in unit's place for numbers ranging from 1 to 100?

1. 20
2. 11
3. 10
4. 19

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If 59 is added to a square of a number, the result is 900. What is the number?
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How many natural numbers n are there such that n!+10 is a perfect square ?
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1 USD = Rs. 67.89. A money changer adds a margin of Rs. 1.11. What will be the cost of 150 USD ? 

1. Rs. 10,183
2. Rs. 10,350
3. Rs. 10,330
4. Rs. 10,450

HARD
Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
For a real number r let r denote the largest integer less than or equal to r. Let a>1 a real number which is not an integer and k be the smallest positive integer such that ak>ak Then which of the following statement is always true?
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The least number, which is to be added to the greatest number of 4 digits so that the sum may be divisible by 345, is _____.
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The number of distinct primes dividing 12!+13!+14! Is
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The largest non-negative integer k such that 24k divides 13! is
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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
The difference of the cubes of two consecutive numbers is 127. What are the numbers?
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The sum of four consecutive even numbers is 107 more than the sum of three consecutive odd numbers. If the sum of the smallest odd number and the smallest even number is 55, then what is the smallest even number?
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If 14 of third-part of number is 5, then the number is:
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Twice the difference between two numbers is equal to their sum. If one number is 15, Find the other number.

1. 15
2. 10
3. 5
4. 20 

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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
The sum of two digits of a number is 13. If 9 is subtracted from the number, the digits are interchanged. What is the number?
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Find the number that is different from other options in the given list of numbers.
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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
Which of the following numbers is perfectly divisible by 4?
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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
The function f :N→I defined by fx=x-5x5 , where N is the set of natural numbers and x denotes the greatest integer less than or equal to x, is:
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Quantitative Aptitude>Arithmetic>Number Systems>Basics of Number Systems
Three-digit numbers are formed from the digits 1,2 and 3 in such a way that the digits are not repeated. What is the sum of such three-digit numbers?
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The annual salary of Arun is Rs. 7.68 lakh. In a month if he spends Rs. 12000 on his children, 113th of rest on food and Rs. 8000 in mutual funds from his monthly salary, then find the monthly saving he is left with.