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- Question
- If a =16 and b= 5, the value of (a 2+ b 2+ ab) / (a 3 - b 3) is?
Options- A. 1/11
- B. 1/19
- C. 121/3971
- D. None of these
- Correct Answer
- 1/11
ExplanationGiven Exp. = (a2+ b2+ ab) / (a3-b3)
= 1 / (a - b)
= 1 / (16 - 5)
= 1/11. - 1. The sum of 5 consecutive odd numbers is 190. What is the sum of the largest and the smallest numbers?
Options- A. 75
- B. 77
- C. 76
- D. 73 Discuss
- 2. A number consists of two digits. The sum of the digit is 10. On reversing the digits of the number, the number decreases by 36. What is the product of the two digits?
Options- A. 21
- B. 24
- C. 36
- D. 42 Discuss
- 3. If in a long division sum,the dividend is 380606 and the successive remainders from the first to the last are 434, 125 and 413, then the divisor is?
Options- A. 451
- B. 843
- C. 4215
- D. 3372 Discuss
- 4. Which of the following numbers is prime?
Options- A. 119
- B. 187
- C. 247
- D. None of these Discuss
- 5. The number (10 n-1) is divisible by 11 for?
Options- A. All Values of n
- B. Odd values of n
- C. Even values of n
- D. n = multiples of 11 Discuss
- 6. Five time of a position integer is equal to 3 less then twice the square of that number. Find the number.
Options- A. 3
- B. 13
- C. 23
- D. 33 Discuss
- 7. A student was asked to multiply a number by 3/2 but he divided that number by 3/2. The result was therefore 10 less then the correct answer. Find the number.
Options- A. 10
- B. 12
- C. 15
- D. 20 Discuss
- 8. The sum of five consecutive odd number is equal to 175. What is the sum of the second large number and the square of the smallest number among them together?
Options- A. 989
- B. 997
- C. 979
- D. none of the above Discuss
- 9. On children day sweet were to be equally distributed among 300 children. But on that particular day 50 children remain absent hence each child got one extra sweet. How many sweet were distributed?
Options- A. 1450
- B. 1700
- C. 1500
- D. 1650 Discuss
- 10. The sum of the two position number P and Q is 2.5 time their difference .If the product of the number 84 then the what is the sum of those two number?
Options- A. 26
- B. 24
- C. 22
- D. 20 Discuss
Number System problems
Search Results
Correct Answer: 76
Explanation:
Let the five consecutive number are N - 2, N - 1, N, N +1, N+2
Sum of numbers = 190
? N-2 + N -1 + N + N + 2 = 190
? 5N = 190
? N = 38
Sum of largest and smallest numbers = (N + 2) + (N - 2)
= 2N = 2 x 38
= 76
Correct Answer: 21
Explanation:
Let the unit digits of the number be N and 10s digit be M
? Number = 10M + N
According to the question
MN = 10 .......(i)
And 10N + M = (10M + N) - 36
? 10N + M - 10M - N = -36
? 9N - 9M = - 36
? N - M = -4 .......(2)
On Adding eq. (i) and (ii) we get
N + M = 10
N - M = - 4
2N = 6
? N = 3 and M = 7
? Required product of two digits = 3 x 7 = 21
Correct Answer: 843
Explanation:
Let d = divisor and q = quotient
First remove the last remainder:
d x q + 413 = 380606
d x q = 380193
So d cannot be even (choice d) or a multiple of 5 (choice c).
If we try choice a or b,
a quick division (by calculator) shows that
380193 = 451 x 843, the other two choices.
(In the absence of choices, we could find the prime factors of 380193,
which are 3 x 11 x 41 x 281 and get various candidate divisors from that.)
So one of them is the divisor and the other the quotient.
So we can just check the first remainder:
843 x 4 = 3372
3806 - 3372 = 434 ... a match!
And just to be sure:
451 x 8 = 3608
3806 - 3608 = 198
So the divisor is 843.
Correct Answer: None of these
Explanation:
119 is divisible by 7, 187 is divisible by 11,247 is divisible by 13 and 551 is divisible by 19. So none of the given numbers is prime.
Correct Answer: Even values of n
Explanation:
For even values of n, the number (10n - 1 ) consists of even numbers of nines and hence it will be divisible by 11.
Correct Answer: 3
Explanation:
Let the number be N
According to the question 5N = 2N2 - 3
? 2N2 - 5N -3 = 0
? (N - 3) (2N + 1) = 0
N = 3 & -1/2
Thus the required number is 3
Correct Answer: 12
Explanation:
Let the number be N
According to the question,
[N x (3/2)] - [N / (3/2)] =10
? 3N/2 - 2N/3 = 10
? (9N - 4N)/6 = 10
? 5N / 6 = 10
? N = (10 x 6)/5 =12
Correct Answer: none of the above
Explanation:
Sum of the five consecutive odd number = N + (N + 2) + (N + 4) + (N + 6) + (N + 8) =175
? 5N + 20 =175
? N = (175 - 20) / 5 = 31
Sum of the second largest and square of smallest one = (31 + 6) + (31)2
= 37 + 961=998
Correct Answer: 1500
Explanation:
let the total number of sweet = N
According to the question
(N/250) - (N/300) = 1
? (6N - 5N) / 1500=1
? N = 1500
Correct Answer: 20
Explanation:
Let the number be P and Q
According to the question
(P + Q) = 2.5 (P - Q)
? P + Q = 2.5P - 25Q
? 3.5Q = 1.5P
? P / Q = 7/3 .....(i)
Now PQ = 84
? Q2 = (84 x 3) / 7
? Q2 = 36
? Q = 6
&ther4; P = (7/3) x 6 = 14
Sum of the number = P + Q = 14 + 6 = 20
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