<|system|>
If $a\ast b = 2a+5b-ab$, what is the value of $3\ast10$?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
From the defined function, we know that $3\ast 10 = 2(3)+5(10)-(3)(10) = 6+50-30=26$.