could someone kindly help me with steps to answer this question?I would prefer if solutions were written on paper :)

200 tennis enthusiasts were asked about which of these grand slam tournaments they have attended: US Open, Wimbledon or Australian Open. 50 attended Australian Open, 95 attended Wimbledon, 110 attended US Open, 25 attended Wimbledon and Australian Open, 30 attended US Open and Australian Open, 40 attended US Open and Wimbledon, 10 attended all three. Refer to the Venn Diagram, where A is Wimbledon, B is US Open and C is Australian Open to answer the following: Australian d Wimbledon Open a g e b C h US Open Determine the number of people that attended only one (but any one) of the three grand slam tournaments