For a rope, cut off half of it for the first time, which is more than 1.5m, and cut off the remaining half for the second time, which is more than1.5m. At this time, there is still 4m left.

This rope used to be () meters long.

(4+1.5) * 2+1.5 * 2 = 25 (m)

This rope used to be 25 meters long.