Number System Questions Practice Question and Answer
8 Q: Find the average of all prime numbers from 1 to 20?
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5ec7ba7c9d324637e76e6b4d- 19.625true
- 29.75false
- 38.66false
- 410.625false
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Answer : 1. "9.625"
Q: The product of two positive numbers is 11520 and their quotient is $$9\over5$$.Find the difference of two numbers?
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5d7f1923e6db8b0af65273b9- 160false
- 264true
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Answer : 2. "64 "
Q: How many numbers can be completely divided to 240?
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5fe1b7c34c864b4aa0de2e0e- 140false
- 220true
- 335false
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Answer : 2. "20"
Q: If the arithmetic means of 3a and 4b is greater than 50, and a is twice b, then the smallest possible integer value of a is:
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5f2b7f8521de6a117aea5ccc- 118false
- 219false
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Answer : 4. "21 "
Q: What is the largest four digit number which is also complete?
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5dccd87fb80c4d4e55b62943- 19999false
- 29909false
- 39801true
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Answer : 3. "9801"
Q: If an 8-digit number 1862383A is divisible by 22, find the value of A.
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62f11f6909a97851b62669a2- 16true
- 24false
- 32false
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Answer : 1. "6"
Q: How many natural numbers divisible by 7 are there between 3 and 200?
1866 05ee845d3a08a50198d8d094c
5ee845d3a08a50198d8d094c- 128true
- 229false
- 327false
- 436false
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Answer : 1. "28 "
Explanation :
Number just greater than 3 which is divisible by 7 = 7
Number just smaller than 200 which is divisible by 7 = 196
Here, a = 7, an = 196,
d = 7, n = 8
an = a + (n –1)d
⇒196 = 7 + (n – 1) × 7
⇒ 
⇒ n = 27 + 1 = 28
Note : We can find the answer after dividing 200 by 7. The quotient is our answer.
Q: What is the greatest number which will divide 110 and 128 leaving a remainder 2 in each case?
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6074020cc61d5c2ec940b217- 118true
- 224false
- 312false
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