How do I do this? Don’t know what to do with the 50

Answer:
I think it resembles the space of the primmer if that makes sense but basically I don't think you have to mind it. I think you can just regard it
Step-by-step explanation:
Answer:
70
Step-by-step explanation:
180 -60 -65 = 55
180 - 55 -50 = 75
180 - 75 - 35 = 70