Symbol Change + - X /

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After interchanging ÷ and +, 12 and 18, which one of the following equations becomes correct?
(90 x 18) + 18 = 60
no
(18 + 6) ÷ 12 = 20
yes
(72 = 18) x 18 = 72
no
(12 + 6) x 18 = 36
no
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If ‘-’ stands for ‘addition’, ‘+’ stands for ‘substraction’, ‘X’ stands for ‘division’, ‘/’ stands for ‘multiplication’, then which one of the following equation is correct?
50 X 5 / 2 - 30 + 25 = 25
yes
50 - 30 + 5 / 2 X 30 = 25
no
40 + 35 X 2 - 50 / 30 = 95
no
30 X 2 - 25 + 50 / 5 = 100
no
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