In ten years, Jackson will be 20+10 = 30 years old.
If Jackson is 20 now, Mandy is 20+10 = <<20+10=30>>30 years old.
Ten years from now, Mandy will be 30+10 = <<30+10=40>>40 years old.
The combined age of Jackson and Mandy ten years from now is 30+40 = <<30+40=70>>70 years
Adele is 3/4 times as old as Jackson, meaning she is 3/4*20 = <<3/4*20=15>>15 years old.
Adele's age will be 10+15 = <<10+15=25>>25 years old ten years from now.
Altogether, Mandy, Jackson, and Adele will have a total of 25+70 = <<25+70=95>>95 years
#### 95