4. If (?) stands for division, (+) stands for multiplication, (÷) stands for subtraction and (×) stands for addition, which one of the following equations is correct?
5. In the following problem, '=' stands for '÷' , '+' stands for '' , 'x' stands for '=', '' stands for '+' and '÷' stands for 'x'. Find the correct equation.
10. If "÷" denotes "multiplied by", "+" denotes "subtracted from", "?" denotes "added to" and "x" denotes "divided by", then which of the following equation is true?