Incorrect labelling of correct/incorrect answers.

**Issue 1**
Correct answer is 50, but labelled as NULL. As a result, only 2 models pass: 17 should.
https://visioncheckup.com/assessments/table-understanding-from-a-web-catalog/

**Issue 2**
Correct answer is 1/One/a single dent. However, only answers presented in integer format are accepted as correct. Only 3/19 pass: 18 should. 
https://visioncheckup.com/assessments/dent-detection/