The following equation is incorrect. Which two signs should be interchanged to correct the equation?
17 x 6 + 2 - 9 ÷ 2 = 44
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90 ÷ 10 + 5 - 6 x 4 = 28
15 x 2 + 10 - 8 ÷ 20 = 15
10 ÷ 18 + 25 x 20 - 5 = 92
16 x 4 - 10 + 10 ÷ 6 = 54
If 18$2 = 10, 8$4 = 6 and 12$18 = 15, then find the value of 7$9 = ?
If "A" means "minus", "B" means "divided by", "C" means "plus" and "D" means "multiplied by", then
54 B 6 A 4 C 2 D 5 = ?
18 + 26 - 25 x 10 ÷ 5 = 42