The constants on PADI exams is always listed at the top of question sheet so there's no need to attempt to memorize them. 

 

This question is in fresh water so the pressure per metre is 0.097 ATM. It's also stating it's looking for the gauge pressure. This means it is zeroed at the surface and doesn't include the pressure exerted by the ambient air.

The sum becomes pretty straightforward once you have this information dialed in. it's depth (16) multiplied by pressure (0.097).