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- Question
The last two digits of 2151415 ?
Options- A. 81
- B. 61
- C. 91
- D. 51
- Correct Answer
- 51
ExplanationUnit digit of this expression is always 1 as the base ends with 1.
For the tenth place digit we need to multiply the digit in the tenth place of the base and unit digit of the power and take its unit digit.
i.e, tenth place digit in 2151 is 5 and
tenth place digit in power 415 is 1
And the units digit in the product of 5 x 1 = 5
Therefore, last two digits of is 51.
- 1. Find the quadratic equations whose roots are the reciprocals of the roots of 2x2+5x+3 ? A) 3x2+5x+2=0 B) 5x2+3x+2=0 C) 3x2-5x-2=0 D) None
Options- A. A
- B. B
- C. C
- D. D Discuss
- 2. The value of -4-(-10) is how much greater then the value of -10-(-4) ?
Options- A. 10
- B. 6
- C. 12
- D. 0 Discuss
- 3. A sum of Rs.1890 has to be used to give 9 prizes to the customers of a super market for their overall academic purchases. If each prize is Rs.30 less than its preceding price, what is the least value of the price ?
Options- A. 90
- B. 95
- C. 85
- D. 80 Discuss
- 4. What should come in place of the question mark(?) in the following questions ? 316 + 412 - 223 - 11112 = ?
Options- A. 1 7/12
- B. 1 5/12
- C. 3 7/12
- D. 3 1/12 Discuss
- 5. What approximate value will come in place of question mark (?) in the following question ? (49.001)2 = ?
Options- A. 2500
- B. 2400
- C. 2600
- D. 2300 Discuss
- 6. Find the Value of ? 5.112.2+5.553.3+6.31.4+7.22.001 = ? x 3.34
Options- A. 81
- B. 77
- C. 73
- D. 89 Discuss
- 7. Can you Solve 7 + 7 ÷ 7 + 7 x 7 + 7 - 7 ÷ 7 + 7 x 7 =
Options- A. 112
- B. 56
- C. 0
- D. 98 Discuss
- 8. 3 x 3 + 3 - 3 + 3 = ?
Options- A. 9
- B. 12
- C. -3
- D. 3 Discuss
- 9. 5068 / 37 x 4 = ?
Options- A. 548
- B. 625
- C. 214
- D. 745 Discuss
- 10. What is 7 + 7 ÷ 7 + 7 × 7 - 7 =
Options- A. 0
- B. 42
- C. 50
- D. 57 Discuss
Mathematical Operations problems
Search Results
Correct Answer: A
Explanation:
The quadratic equation whose roots are reciprocal of can be obtained by replacing x by 1/x.
Hence, 2(1/x)(1/x)+ 5(1/x) + 3 = 0
=>
Correct Answer: 12
Explanation:
-4-(-10) = -4+10 = 6
-10-(-4) = -10+4= -6
Therefore, 6-(-6) = 6+6 = 12
Correct Answer: 90
Explanation:
Let the least value of the prize = Rs. x
Then the next value of the prize is x+30 , x+60, x+90, ....x+240.
Given total amount of cash prizes = Rs.1890
--> x + (x+30) + (x+60) + (x+90) + ....+ (x+240) = 1890
--> 9x + (30 + 60 + 90 + 120 + 150 + 180 + 210 + 240) = 1890
--> 9x + 30(1 + 2 + 3 + 4....+ 8) = 1890
--> 9x + 30(36) = 1890
--> 9x = 810 --> x=90
Hence the least value of the prize x=90
Correct Answer: 3 1/12
Explanation:
? = (3 + 4 - 2 - 1) + ( 1/6 + 1/2 - 2/3 - 11/12)
= 4 + [(2+6-8-11)/12]
= 4 - (11/12 )= 31/12.
Correct Answer: 2400
Explanation:
Given (49.001)2 = ?
=> =~ 49 x 49
=~ 2401
=~ 2400
Correct Answer: 89
Explanation:
This can be done in a method called Approximation.
Now,
Correct Answer: 112
Explanation:
Correct Answer: 12
Explanation:
Using BODMAS law,
3 x 3 + 3 - 3 + 3 =
3 x 3 = 12
= 12 + 3 - 3 + 3
= 9 + 3
= 12
Hence, 3 x 3 + 3 - 3 + 3 = 12.
Correct Answer: 548
Explanation:
? = 5068 x 4/37
? = 548
Correct Answer: 50
Explanation:
Given 7 + 7/7 + 7 x 7 - 7
By using BODMAS rule,
7 + 1 + 7 x 7 - 7
= 8 + 49 - 7
= 57 - 7
= 50.
Hence 7 + 7/7 + 7 x 7 - 7 = 50.
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