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Number System

Number System Questions: What is Number System in Maths? Divisibility Rules for 7, Divisibility Rules for 11, Binomial Theorem Questions, Factorize Expressions

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Online Aptitude Questions with Answers on Number System

Q156. **A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:**

  1.  3
  2.  5
  3.  9
  4.  11

Solution : 11
Q157. **The difference between a two-digit number and the number obtained by interchanging the two digits is 63. Which is the smaller of the two numbers?**

  1.  29
  2.  70
  3.  92
  4.  Cannot be determined
  5.  None of these

Solution : Cannot be determined
Q158. **The difference between a two-digit number and the number obtained by interchanging the digit is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1:2?**

  1.  4
  2.  8
  3.  16
  4.  None of these

Solution : 8
Q159. **A number consists of 3 digit whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits are reversed. The number is:**

  1.  145
  2.  253
  3.  370
  4.  352

Solution : 253

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Q160. **A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:**

  1.  18
  2.  24
  3.  42
  4.  81

Solution : 24
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