After interchanging div and +, 12 and 18...

After interchanging `div` and +, 12 and 18, which one of the following equations becomes correct?

`(90 xx 18 ) + 18 = 60`

`(18 + 6 ) div 12 = 2 `

`(72 div 18) xx 18 = 72`

`(12 + 6) xx 18 = 36`

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The correct Answer is:

`(12 +6) xx 18 = 36`
`implies (18 + 6) xx 12 =36`
`implies 3 xx 12 = 36`

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