total marks = 80
-------------------------------------------------------------------------------------------------------------Explanation:
To find the total marks for the test, you can use the following proportion:
percentage score = (marks obtained / total marks) x 100%
Substituting the given values:
52.5% = (42 / total marks) x 100%
Dividing both sides by 52.5:
1 = (42 / total marks) / 0.525
Simplifying:
total marks = 42 / (1/0.525)
total marks = 80
Therefore, the test was out of 80 marks.