The easiest way to get the correct answer for questions like this is to take the object to the surface first. This gives you a constant to work with for the second part of the equation.
Let's work through it.
20% capacity at 25m/sw means it's under 3.5ATA of pressure. If taken to 1ATA it's capacity will increase to 70% (20x3.5=70)
We can then take the lifting device back down to 10m/sw which means it will be under 2ATA of pressure leaving it's capacity at 35%. (70/2=35)
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Occasionally in GSP exams, you may be asked a question from PADI's Guide To Teaching as this is an extension of your PADI Instructor Manual. Think of it as the 'how' to the PADI Instructor Manuals 'what'.
Grab your PADI Guide To Teaching and look for the section - Professional Association of Diving Instructors and you'll see their Core Competencies along with their Mission Statement as well as a history of PADI itself.
Know your way around a vessel?
The Stern is at the rear so if you're facing portside will be to your right, starboard to your left and the bow behind you.
Listed underneath Table 3 of your PADI or on the inside lid of your eRDPml is listed Special Rules for Multiple Dives.
This states that when planing 3 dives or more any dive ending in pressure group Y must have a 3-hour surface interval. This then applies to all subsequent dives in that sequence.
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