Number System Questions Practice Question and Answer
8 Q: The number 2918245 is divisible by which of the following numbers?
2122 064abdfb8b394764d11c76888
64abdfb8b394764d11c76888- 13false
- 211true
- 312false
- 49false
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Answer : 2. "11"
Q: Four numbers, when arranged in ascending order, are w, x, y and z. The average of the smallest three numbers is 25.5 while the average of the largest three was 29.5. What is the range of the data?
2120 05f87fb63e6aa3e1d0bcbdb31
5f87fb63e6aa3e1d0bcbdb31- 110false
- 215false
- 312true
- 414false
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Answer : 3. "12"
Q: Find the value of $$ {1\over{2×5}}+{1\over {5×8}}+{1\over {8 × 11}}+......{1\over {23 × 26}}=?$$
2117 05fc47824070eb7152d7ea29c
5fc47824070eb7152d7ea29c- 1$$ {1\over 11}$$false
- 2$$ {3\over 11}$$false
- 3$$ {2\over 13}$$true
- 4$$ {4\over 11}$$false
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Answer : 3. "$$ {2\over 13}$$"
Q: How many natural numbers divisible by 7 are there between 3 and 200?
2114 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: A number x when divided by 289 leaves 18 as the remainder. The same number when divided by 17 leaves y as a remainder. The value of y is
2105 05ee854df642b74661722c43e
5ee854df642b74661722c43e- 13false
- 21true
- 35false
- 42false
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Answer : 2. "1 "
Q: Find the average of all prime numbers from 1 to 20?
2084 05ec7ba7c9d324637e76e6b4d
5ec7ba7c9d324637e76e6b4d- 19.625true
- 29.75false
- 38.66false
- 410.625false
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Answer : 1. "9.625"
Q: Sum of two numbers is thrice their difference. Their ratio is
2083 05dbfb675c559bc74bfc4272c
5dbfb675c559bc74bfc4272c- 11 : 2false
- 22 : 1true
- 33 : 1false
- 41 : 3false
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Answer : 2. "2 : 1"
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:
2067 05f2b7f8521de6a117aea5ccc
5f2b7f8521de6a117aea5ccc- 118false
- 219false
- 320false
- 421true
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