It took Lara five days to read a novel. Each day after the first day, Lara read half as many pages as the day before. If the novel was 310 pages long, how many pages did she read on the first day?
x + 1/2 x + 1/4 x + 1/8x + 1/16x = 310
31/16 x = 310
x = first day = 160 pages