Suppose a carpenter's ruler was marked in thirty seconds. What would be the fraction and its decimal equivalent for the mark on the ruler between 23 24
and
32?
The fraction is and the decimalis
(Simplify your answers.)

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is