What should come in place of the question mark (?) in the following number series
1015 508 255 129 66.5 ? 20.875
1015(×1/2+0.5)508(×1/2+1)255(×1/2+1.5)129(×1/2+2)66.5(×1/2+2.5)35.75(×1/2+3)20.875
8 9 20 63 256 1285 ?
980 484 236 112 50 ? 3.5
Directions (next six questions) : What should come in place of the question mark(?) in the following questions
(15.5% of 1245) - (12.5% of 1458) = ?
?%of 658+40%of 845 = 568.3
1728÷3√262144×?-288=4491