If 7 # 4 = 15 and 9 # 6 = 21, then 8 # 5 = ?

Question

Accepted Answer

1. Look at the examples: $7\#4=15$ and $9\#6=21$.

2. Check a possible rule: $7+2	imes4=7+8=15$ and $9+2	imes6=9+12=21$.

3. So the rule is: **$a\#b=a+2b$**.

4. Apply it: $8\#5=8+2	imes5=8+10=18$.

FINAL_ANSWER: <d>

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