How do I estimate a single score from two different sets of score each with different denominator?

[roshan2022]

I wanted to have a combined score for a students test.
18 student have written three different tests. First test has 10 maximum marks, second test has 15 maximum marks, third test has 170 maximum marks.

 

[fed2]

should a test with more marks recieve more weight when computing the single score (presumably an average)?