A liter of diesel costs 18/ 36 = <<18/36=0.5>>0.5 €.

64 liters of diesel fuel cost 0.5 X 64 = <<64*0.5=32>>32 €

# Answer

32
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
36 liters of diesel fuel is worth €18. The tank of this pickup truck can hold 64 liters. How much does a full tank of diesel fuel cost?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
32
36 liters of diesel fuel is worth €18. The tank of this pickup truck can hold 64 liters. How much does a full tank of diesel fuel cost?
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