In the adjacent Venn diagram, if n(U)=80 , n(P)=40, n(Q)=28, n(PnQ)=12

This question was asked in Example 13

In the adjacent Venn diagram, if n(U)=80 , n(P)=40, n(Q)=28, n(PnQ)=12, and n(PnR)=10,
1. Mark the number of elements in each region .
2. Determine the value of n(PUQ) and n((QUR)').