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- Question
The expression of 5008 km in scientific notation is
Options- A. 50.08 x 10^3 kms
- B. 5.008 x 10^-3 kms
- C. 5.008 x 10^3 kms
- D. 500.8 x 10^3 kms
- Correct Answer
- 5.008 x 10^3 kms
ExplanationWe know that, any decimal number when multiplied by the multiples of 10, the decimal point moves to right the number of zeroes in the multiplying number.
For example ::
0.0410 x 100 = 4.10 (Number of zeros in 100 are 2. So, the decimal point in 0.0410 moves two places to the right and becomes 4.10.)
Similarly, here in the option C) 5.008 x 10^3 kms it makes 5008 kms as the number of zeros in 10^3 i.e, 1000 are 3 and 5.008 becomes 5008.
- 1. Which of the following number is divisible by 24?
Options- A. 37804
- B. 2015736
- C. 36718
- D. 53810 Discuss
- 2. How many rectangles can be drawn with 36 cm as the perimeter, given that the sides are positive integers in cm?
Options- A. 8
- B. 9
- C. 10
- D. 11 Discuss
- 3. 3x3x3+3+3/3 = ?
Options- A. 11
- B. 3.33
- C. 31
- D. None of the above Discuss
- 4. a2 + b2 + c2 -ab- bc - ca = 0, iff
Options- A. abc = -1
- B. a = b = c
- C. abc = 1
- D. abc = 0 Discuss
- 5. The binary system uses powers of
Options- A. 0
- B. 1
- C. 2
- D. None of the above Discuss
- 6. What is the value of a two?digit number? A. The sum of the digits is 15. B. The difference of the squares of the digits is 45. C. The difference of their digits is 3.
Options- A. B and C together are sufficient
- B. Any one pair of A and B, B and C or C and A is sufficient
- C. C and A together are sufficient
- D. A and B together are sufficient Discuss
- 7. Hemavathi cut a cake into two halves and cuts one half into smaller pieces of equal size. Each of the small pieces is fifteen grams in weight. If she has nine pieces of the cake in all with her, how heavy was the original cake ?
Options- A. 240 gms
- B. 280 gms
- C. 180 gms
- D. 170 gms Discuss
- 8. An intelligent boy is doing a jigsaw with 275 pieces. Each day that he fits pieces together there are fewer pieces left, and it is reasonable to assume that he fits more pieces each day because the number left to sort out diminishes progressively. Hence he is able to fit an extra piece as each day goes by. On the first day he fits 20 pieces. How many days does it take for him to complete the puzzle ?
Options- A. 11 days
- B. 15 days
- C. 13 days
- D. 16 days Discuss
- 9. In three coloured boxes - Red, Green and Blue, 108 balls are placed. There are twice as many balls in the green and red boxes combined as there are in the blue box and twice as many in the blue box as there are in the red box. How many balls are there in the green box ?
Options- A. 76
- B. 54
- C. 64
- D. 48 Discuss
- 10. In a class there are certain no. of boys and girls. If 15 girls are absent then no. of boys will be twice that of girls. If 45 boys are absent then girls strength will be 5 times that of boys. Find number of boys actually present ?
Options- A. 40
- B. 50
- C. 55
- D. 35 Discuss
Arithmetic Reasoning problems
Search Results
Correct Answer: 2015736
Explanation:
Divisibility rule for 24 is the number should be divisible by 3 and 8. As we know that 24 = 3 x 8
Now,
Divisibility rule for 3 :
If the sum of the digits of a number is divisible by 3, then the number is divisible by 3.
Divisibility rule for 8 :
The last three digits of a number should be divisible by 8.
Hence, check for the given options,
A) 37804 => 804 is not divible by 8.
C) 36718 => 718 is not divible by 8.
D) 53810 => 810 is not divible by 8.
B) 2015736 => 736 is divisble by 8 and sum 2 + 0 + 1 + 5 + 7 + 3 + 6 = 24 which is divisible by 3.
Hence, 2015736 is divisible by 24.
Correct Answer: 9
Explanation:
Perimeter = 36
? 2 ( l + w ) = 36
? l + w = 18
Since length and width are positive integers in centimeters.
Therefore, possible dimensions are :
( 1, 17 )cm , ( 2, 16 ) cm , ( 3, 15 ) cm, (4 , 14) cm, ( 5,13) cm, ( 6, 12) cm , ( 7, 11) cm, ( 8, 10 ) cm, ( 9, 9) cm.
Hence, there are 9 rectangles.
Correct Answer: 31
Explanation:
We all know about BODMAS rule, by using that
3x3x3+3+3/3
= 3x3x3+3+1
= 27+3+1
= 27 + 4
= 31
Hence, 3x3x3+3+3/3 = 31.
Correct Answer: a = b = c
Explanation:
Here given formula is
and it is possible if and only if a = b = c.
From the trial and error method,
1) Let a = b = c = 1
Now substitute these values of a, b, c in the above formula.
We get 1 + 1 + 1 - 1 - 1 - 1 = 3 - 3 = 0
2) Now, let a = b = c = 4
Now substitute these values of a, b, c in the above formula.
We get 16 + 16 + 16 - 16 - 16 - 16 = 48 - 48 = 0.
Hence, it is possible that
Correct Answer: 2
Explanation:
Binary system is what the representation uses only two digits 0 & 1.
It uses only the powers of 2.
Correct Answer: Any one pair of A and B, B and C or C and A is sufficient
Explanation:
From the given data,
Let the two gits of a number be x & y
A) x + y = 15
B)
(x+y) (x - y) = 45
C) x - y = 3
From any 2 of the given 3 statements, we can find that 2 digit number as
2x = 18 => x = 9
=> y = 6
Hence, 2 digit number is 96.
Any one pair of A and B, B and C or C and A is sufficient to find.
Correct Answer: 240 gms
Explanation:
The nine pieces consist of 8 smaller equal pieces and one half cake piece.
Weight of each small piece = 15 g.
So, total weight of the cake = [2 x (15 x 8)]g = 240 g.
Correct Answer: 11 days
Explanation:
Let 'n' number of days it take to complete.
we know that sum of n number= n/2[2a+(n-1)d]
where a=20,d=1;
n/2[2x20+(n-1)1]=275
n[n+39]=550
+ 39n - 550 = 0
+ 50n - 11n - 550 = 0
(n-11) (n-50) = 0
n-11 = 0;
n = 11(Days).
Correct Answer: 54
Explanation:
Let R, G and B represent the number of balls in red, green and blue boxes respectively.
Then, .
R + G + B = 108 ...(i),
G + R = 2B ...(ii)
B = 2R ...(iii)
From (ii) and (iii), we have G + R = 2x 2R = 4R or G = 3R.
Putting G = 3R and B = 2R in (i), we get:
R + 3R + 2R = 108 6R = 108 R = 18.
Therefore Number of balls in green box = G = 3R = (3 x 18) = 54.
Correct Answer: 50
Explanation:
15 girls are absent => b = 2(g-15)...... eqn...(1)
45 boys are absent => g - 15 = 5(b-45).....eqn...(2)
=> g = 5(b-45) + 15
=> b = 2((5(b-45)+15)-15)
=> b = 2(5b - 225 + 15 - 15)
=> b = 2(5b-225)
=> b = 10b - 450
=> 9b = 450
=> b = 50
so from equation(2)
g - 15 = 5(b - 45)
=> g - 15 = 5(50-45)
=> g - 15 = 5(5)
=> g = 25 + 15
=> g = 40
Therefore, the number of boys = 50 and girls = 40
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