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For the intersection of R and S, we need to find what number set R and set S has in common. Since 20 is in R and 20 is in S then
R ∩ S=20.

Answer:   R ∩ S = {20}.

Step-by-step explanation:  We are given the following two sets :

R = {10, 15, 20}

and

S = {20, 25}.

We are to find the intersection of the sets R and S, .i.e., R ∩ S.

We know that

the intersection of two sets is a set that contains the elements which are common to both the sets.

Therefore, the intersection of the sets R and S is given by

[tex]R\cap S=\{10,15,20\}\cap \{20,25\}=\{20\}.[/tex]

Thus,  R ∩ S = {20}.

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