Read the question again.
Thanks.

OK so I miss read the question. At least my maths was correct, my reading failed.

So up date with correct answers.
Assume real world scores the possible actual goals scored are going to be any of these options in each half.
First Half 3/5 = any of the following: (Top 6/Total)
3-5, 6-10 , 9-15, 12-20, 15-25 , 18-30, 21-35
Second Half 7/20 = any of the following: (Top 6/Total)
7-20, 14-40
Then it's just a case of adding together each possible outcome and rounding down.
So you have at least 14 potential answers. (More if it's some extreme example of goal scoring, of infinite if this was a pure maths question not based on real world example)
These 7 possible answers if 7 goals scored 2nd half by top 6:
10/25 = 2/5
13/30 = 13/30
16/35 = 16/35
19/40 = 19/40
22/45 = 22/45
25/50 = 1/2
28/55 = 28/55
Due to not being able to round down most of the answers happen to be the actual number of goals scored, Just 2 could be rounded down.
So there isn't one single answer.
Given that the record number of goal scored in a weekend is 43 these 4 answer would be the possible correct ones.
10/25 = 2/5
13/30 = 13/30
16/35 = 16/35
19/40 = 19/40
But there no one correct answer.