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    Which of the following equations is correct when the numbers 3 and 9 are interchanged and the signs - and × are interchanged?
    Question

    Which of the following equations is correct when the numbers 3 and 9 are interchanged and the signs - and × are interchanged?

    A.

    12 ÷ 9 - 2 × 7 + 3 = 10

    B.

    1 - 9 × 10 ÷ 4 + 3 = 32

    C.

    . 9 ÷ 4 × 3 + 1 - 6 = 18

    D.

    9 ÷ 2 × 1 - 3 + 5 = 15

    Correct option is A

    Given: 
    Swap numbers 3 ↔ 9
    Swap signs − ↔ ×
    Operation preference wiseSymbolBrackets[],,()Orders, of(power),√(root),ofDivision÷Multiplication×Addition+Subtraction−\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline \end{array} ​
    Put given number and sign in the options 
    A) ​12 ÷ 9 - 2 × 7 + 3 = 10
    12 ÷ 3 × 2 - 7 + 9 = 10
    4 × 2 - 7 + 9 = 10
    8 - 7 + 9 = 10
    17 - 7  = 10
    10 = 10 (Satisfied)

    Thus, correct option is (a).

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