A tile pattern has 10 tiles in Figure 2 and increases by 3 tiles for each
figure.

You will need to make the fractions have a common denominator in order to add or subtract. So 1/6 and 3/5 share a common denominator of 30, making 1/6 into 5/30 and 3/5 into 24/30. So 5/30 plus 24/30 equals 29/30. So, 30/30 (the whole) minus 29/30 equals 1/30, which is the amount of time spent on Sunday.