You can actually take 40% of 70 and get 28, then subtract that from 70, which gives you 42 goals.
Hope this helped! If it didn't or you need further explanation, please tell me so I can do so.
Answer:
42
Explanation:
40% by star player
100 - 40 = 60% by others
60% of 70
60/100 × 70 = 42
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