Greta added 3/6 of a cup of sugar to her cake mix, then sprinkled
1/6 of a cup of sugar over the top of the finished cake. Which fraction
represents the total amount of sugar that Greta used for the cake?
Express the answer in lowest terms.
1/6 of a cup
1/2 of a cup
3/6 of a cup
2/3 of a cup