The correct option is
A 47.51
The riddle is given as:
"A is 32.13 more than B and B is 42.31 less than 50."
Here, the riddle can be simplified into equations.
The equation for A can be formed as:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1206249/original_Screenshot_2021-06-27_at_8.59.21_AM.png)
Similarly, the equation for B is formed as:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1206251/original_Screenshot_2021-06-27_at_9.01.02_AM.png)
Calculating 50.00 - 42.31 using the standard method, we get:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1206252/original_Screenshot_2021-06-27_at_9.01.39_AM.png)
Hence, B = 7.69
Now, A = B + 32.13
∴ A = 7.69 + 32.13
Calculating 7.69 + 32.13 using the standard method, we get:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1206253/original_Screenshot_2021-06-27_at_9.03.20_AM.png)
Hence, A = 39.82
∴ Values are A = 39.82 and B = 7.69
So, A + B = 39.82 + 7.69
Calculating 39.82 + 7.69 using the standard method, we get:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1206254/original_Screenshot_2021-06-27_at_9.04.14_AM.png)
∴ The value of A + B is 47.51.