It could be a lot of things.
As far as a percentage goes, it would be 77.5% which is a solid C in most grading systems.
And 40 - 31 = 9.
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31/40 = 31 ÷ 40 = 0.775
16/40 + 15/40 = 31/40
31/40 = 77.5%.
ratio 124 to 40 = 31:10124 : 40 = 31 : 10
9 subtracted from 40 = -31