Arman's sister is 4 + 2 = <<4+2=6>>6 years old now.

So, Arman is 6 x 6 = <<6*6=36>>36 years old.

Hence, Arman will be 40 in 40 - 36 = <<40-36=4>>4 years.

# Answer

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<|im_start|>system
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<|im_start|>user
Arman is six times older than his sister. His sister is 2 years old four years ago. In how many years will Arman's age be 40?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Arman is six times older than his sister. His sister is 2 years old four years ago. In how many years will Arman's age be 40?
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