Explanation

Question:    7        12     19     ?        39

Difference:      5            7            9        12

So 19+ 9 = 28      

Explanation

63 + 64 = 127.

Explanation

Clearly, the given sequence follows the pattern:

+5, +7, +9 ...  i.e., 7 + 5 = 12,  12 + 7 = 19, ... 
∴Missing Number = 19 + 9 = 28.
Hence, the answer is  28.

Explanation

Correlation coefficients are indicators of the strength of the linear relationship between two different variables, x and y. A linear correlation coefficient that is greater than zero indicates a positive relationship. A value that is less than zero signifies a negative relationship

Explanation

25/100

=1/4

Explanation

1/2 of 1028 = 514

1/9 of 504 = 56

1/3 of 741 = 247

1/4 of 236 = 59

Explanation

650×650=422500

Explanation

13/45 = 0.29  

17/25= 0.68  

31/37= 0.84

25/41= 0.61

Explanation

47 × 47 = 2209

Clearly, 6 should be added to 2203 to get a perfect square.

Explanation

16 of 40 can be written as:

1640

Multiply both numerator & denominator by 100

1640 × 100100 = 40100 = 40%

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If you are using a calculator, simply enter:

16÷40×100 = 40%