Maths Quiz 1/2/2016

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Directions (Q. 1 – 5): What value should come in place of question mark (?) in the following questions? 
1.  ∛(13824 )+ √1849= ∛9261+ √(?) 
A) 1256
B) 1936
C) 2116
D) 2456
E) 2216

2. (0.8) ÷ (0.2)^2  × (0.6)^2= (2.4)^2  × ?
A) 1. 8
B) 1.4
C) 1. 25
D) 1. 6
E) 2. 6

3. 7654.32 + 8962.81 +  3432.12 – 512.32 + 212.82 + 316. 84
A) 20056.49
B) 20046.79
C) 20065.49
D) 20066.59
E) 20062.59

4. 812 + 912 + 516 + 241 + 346 + 329 = 12 * ?
A) 263
B) 265
C) 326
D) 363 
E) 236

5. ∜(1296 )+ ∜(2401 )+ ∜(6561 ) - ∜(256 )= ?
A) 14
B) 18
C) 22
D) 16
E) 15

Directions(6-10):What approximate value should come in place of question mark(?) in the following questions?(You are not expected to calculate the exact value)
6. 5.5 % of 225 + 7.5% of 625 – 18.6% of 182 = ?
A) 16
B) 14
C) 19
D) 25
E) 18

7. √2.25+√6.76+ √9.61+ √10.89-√23.04  
A) 4
B) 8
C) 7
D) 3
E) 5

8. 2.26 + 3.86 + 2.96 + 5.89 +? = 4.4 ÷1.1 ×5.89
A)-7
B) 8
C) 7
D) 9
E) 10

9. (5.96)^2 + (7.89)^2+ (2.9)^2+ (3.1)^2= (2.42)^2+ (2.68)^2+ ? 
A) 105
B) 108
C) 107
D) 106
E) 110

10. (9.1 * 5.7 * 6.72 * 9.5) – (1.9 * 2.1 * 3 * 1.7) = ?
A) 3372
B) 3378
C) 3568
D) 3328
E)3358

Directions(11-13): What value should come in place of question mark (?) in the following number series?

11. 2  3  7  25  121 ?
A) 721
B) 621
C) 490
D) 421
E) 369 

12. 2401 2601 2809 3025 3249 ?
A) 3721
B) 3969
C) 3844
D) 3364
E) 3481

13. 20  30  42  56  72 ?
A) 90
B) 92
C) 88
D) 86
E) 94

14. Twelve years ago A was half of B’s age. If the ratio of their present ages is 3 :5, what will be the sum of their present age?
A) 76 years
B) 46 years
C) 106 years
D) 96 years 
E) None of these

15. 15% more is gained by selling a cow for Rs. 10105 than by selling it for Rs. 10000. Find the cost price of the cow.
A) Rs. 700
B) Rs. 1000
C) Rs. 800
D) Rs. 1080
E) None of these


ANSWER

1. C
2. C
3. D
4. A
5. B
6. D
7. E
8.  D
9.  A
10. C
11. A
12. E
13. A
14. D
15. A

How to solve cube root easily

∛(13824 )

Step 1 - Cube root , nam se hi pata lag raha hai 3 numbers ka pair , so just take last 3 numbers 824 as a pair !!

Step 2 - Now take last digit of 824 , that is 4 . Ab ye socho ki last me 4 , (0-9) me kaun se number ka cube karne par aaya hoga, to 4 hoga wo number kyuki 4 * 4 * 4 = 64 , last me 4 aa gaya !!

Step 3 - It means hamara jo actual ans hoga usme last digit 4 hogi !!

Step 4 - Now take remaining digit that is 13 , ab ye socho ki 13 se kam me kis number ka cube hume mil raha hai , sirf 2 ka cube 8, 13 se kam hoga , kyuki 3 ka cube 27 , wo jyada ho ja raha hai !!

Step 5 - So last digit mil gayi thi 4 aur ramaning digit se 2 aa gaya , so our actual ans is 24 !!

Just practice it , you will get cube root withing seconds !!

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