Two ways to do it:  (1) The formula way and 
(2) the Venn Diagram-Algebra way
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(1) The formula way:

P(T' and G') = 

By DeMorgan's law,  T' and G' = (T or G)' , so

P[(T or G)'] = 

P(T or G) = 1 -  =  -  = 

P(T or G) = P(T) + P(G) - P(T and G)

 =  +  - P(T and G)

P(T and G) =  +  - 

P(T and G) = 
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(2) the Venn Diagram-Algebra way
 



We have the system of equations:

x + y     = 14
    y + z = 16
x + y + z + 3 = 25

Solve that and get x = 6, y = 8, z = 8

So we have:



The one that play tennis and golf are in this part of the
Venn diagram, because it's part of both T and G:



That's 8 out of 25 which is 

Edwin