###Human: There are four growing trees. The first tree grows 1 meter/day, the second grows the same amount in half the time, the third grows 2 meters/day, and the fourth tree grows a meter more than the third each day. How many meters did the trees grow in total in 4 days?, ### Assistant: The second tree grows 1*2 = 2 meters a day.
The fourth tree grows 2+1 = 3 meters a day.
The first tree grows 4*1 = 4 meters in 4 days.
The second tree grows 2*4 = 8 meters in 4 days.
The third tree grows 2*4 = 8 meters in 4 days.
The fourth tree grows 3*4 = 12 meters in 4 days.
In 4 days, all four trees grew 4+8+8+12 = 32 meters combined. 
 So the answer is :  32