human
It takes 7 years for an apple tree to bear fruit. If Lydia planted a tree when she was 4 years old and is now 9 years old, how old would she be when she gets to eat an apple from her tree for the first time?
assistant
How many years has the tree been planted? ** The tree has been planted for 9 - 4 = <<9-4=5>>5 years
How many years will it take for the tree to bear fruit? ** It will take another 7 - 5 = <<7-5=2>>2 years for it to bear fruit
How old will Lydia be when she gets to eat an apple from her tree for the first time? ** Lydia will be 9 + 2 = <<9+2=11>>11 years old
#### 11