4. In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question. 12 - 6 + 4 x 10 ÷ 16 = ?
6. In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation. 53 34 = 5334 65 46 = 6456 75 24 = ?
9. Some equations have been solved on the basis of a certain pattern. Find the correct answer for the unsolved equation on that basis. 8x7x6=765 5x3x2=421 9x6x4= ?