One way to do this is to change the units into common units and then add them up.
For example we can change L to cL by multplying by 100.
1L=100cL
7.25L = 7.25x100cL = 725cL
Adding 725cL + 875cL = 1600cL
Changing cL to mL
1cL=10mL
1600cL = 1600x10mL = 16000mL
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