Christian is twice as old as Brian. In eight more years, Brian will be 40 years old. How old will Christian be in eight years?
If in eight years Brian will be 40 years old, he is currently 40-8 = <<40-8=32>>32 years old.
Since Christian is twice as old as Brian, he is 2*32 = <<2*32=64>>64 years old.
In 8 years, Christian will be 64+8 = <<64+8=72>>72 years old.
#### 72