Human: In 10 years, Melanie will be 18 years old. In how many years will her age be thrice her present age? Assistant: 
How old is Melanie now? ** Melanie's present age is 18 - 10 = <<18-10=8>>8.
How old will Melanie be in 10 years? ** Thrice Melanie's present age is 8 x 3 = <<8*3=24>>24.
How old will Melanie be in 16 years? ** So, she will be thrice her present age in 24 - 8 = 16 years.
#### 16