Question 15

If 5 # 9 @ 7 = 52 and 3 @ 9 # 2 = 21, then

7 # 6 @ 9 = ?

If 5 # 9 @ 7 = 52 and 3 @ 9 # 2 = 21, that means '# = *' and ' @ = +'

Hence, 7 # 6 @ 9 = 7 * 6 + 9 = 51 

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