Look at this series: 80, 10, 70, 15, 60, ... What number should come next?  Choose the correct choice from the following options:
A) 20	B) 23	C) 25	D) 30	E) 35
This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.   20NSWER 20
<result>A</result>
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?