SOLUTION: Tom scored 50% in a test. If his actual marks were 15 determine the total marks for the test.

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Question 1074214: Tom scored 50% in a test. If his actual marks were 15 determine the total marks for the test.
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
let x = the total marks.

if he scored 50%, that means he got 50% right = .5 * x.

the actual number of marks he got right is 15.

.50 * x = 15

solve for x to get x = 15/.5 = 30

there were a total of 30 marks for the test.

if he got them all right, his score would have been 100%.

he only got half of them right, so his score is 15.