The following equation is incorrect. Which two signs should be interchanged to correct the equation?
16 x 4 - 10 + 10 ÷ 6 = 54
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21 + 16 x 35 - 70 ÷ 20 = 9
26 - 2 x 30 ÷ 6 + 16 = 20
7 x 16 + 20 - 20 ÷ 10 = 31
40 ÷ 8 x 5 + 15 - 2 = 30
10 ÷ 18 + 25 x 20 - 5 = 92
9 ÷ 3 - 30 x 7 + 6 = 15
If 7*7 = 140, 6*1 = 70 and 3*5 = 80, then find the value of 4*4 = ?