A bottle can hold 2 cups of water. How many cups of water are needed to fill up 10 whole bottles and 5 half-capacity bottles?
For 10 whole bottles, you will need 10*2=<<10*2=20>>20 cups of water.
With 5 half-capacity bottles, it requires 5*1=<<5*1=5>>5 cups of water.
In total, you need to have 25+5=<<25+5=30>>30 cups of water to fill them all.
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