Ming was planning a trip to western samoa before going she did some research and learned that the exchange rate is 6 tala for $2 how many tala would she get if she exchange $6

What's the relationship of the money she wants to exchange, 6 dollars, and the money she knows the exchange rate for? 

6 is 3 times 2: she wants to exchange three times the amount for which she knows the exchange value is 6 tala. 

so she has to multiply 6 tala by 3: 6*3=18

she would get 18 tala.