If Carla had 400 chickens on her chicken farm, the number that died is 40/100*400= <<40/100*400=160>>160
Carla remained with 400-160=<<400-160=240>>240 chickens.
Carla then bought 10*160= <<10*160=1600>>1600 new chickens.
The total number of chicken that Carla had now is 1600+240=<<1600+240=1840>>1840
#### 1840