# 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

Q81. How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers?

1.  1200
2.  1092
3.  1082
4.  1192

Solution : 1092
Q82. **A laborer is engaged for 30 days on the condition that he receives Rs.25 for each day he works and is fined Rs.7.50 for each day is absent. He gets Rs.425 in all. For how many days was he absent?**

1.  6
2.  8
3.  9
4.  10

Solution : 10
Q83. **A man engaged a servant on the condition that he would pay him Rs.900 and a uniform after one year service. He served only for 9 months and received uniform and Rs.650, find the price of the uniform?**

1.  80
2.  85
3.  90
4.  100

Solution : 100
Q84. **By how much is 3/5th of 875 greater than 2/3 of 333?**

1.  199
2.  303
3.  362
4.  233

Solution : 303

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Q85. <If 4 2/3 is subtracted from 10 1/2 and the difference is multiplied by 450, then what is the final answer?> ![enter image description here][1] [1]: https://storage.googleapis.com/codegrounds/questionImages/e5bba3ee-d7e0-47c4-94b8-2246f251b886_USER-RecruiterCopy_ITEM-Capture.PNG

1.  2725
2.  2675
3.  2875
4.  2525
5.  None of these

Solution : None of these
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