Answer:
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24% = 24/100 = 12/50 = 6/25
24% is 6/25 fraction of world's energy.
So
2/6 of 318=106
so 106-1/2 or 106/2=53
So he has 53 boxes left
If your turn 3/5 into 6/10 it becomes easier to turn into a decimal or a percentage.
3/5 = 0.60 = 60%