# 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

Q41. **The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is?**

1.  4
2.  6
3.  1
4.  None of these

Solution : 6
Q42. **If a number is subtracted from its square we get 272. Find the number?**

1.  24
2.  14
3.  17
4.  22

Solution : 17
Q43. **If 70% of a is equal to 40% of b, then ratio between a and b is?**

1.  4: 7
2.  7:4
3.  7:11
4.  None

Solution : 4: 7
Q44. **Two third of three- fifth of one fourth of a number is 24, what is 30% of that number?**

1.  42
2.  72
3.  90
4.  69

Solution : 72

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Q45. **A number when, 28 subtracted from it reduces to its one third. What is the value of 50% of that number?**

1.  42
2.  84
3.  21
4.  24

Solution : 21
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