In the morning, 120 cubic meters of water from the tank was used for planting. In the afternoon, 125 percent more than the amount of water used in the morning was pumped into the tank, which is 120+1.25×120, or 270 cubic meters.Let h= the increase in the height of the water, in meters, after the water was pumped into the tank. 6×4×h=270−120, so solving the equation for h gives h=641​.