Reasoning mathematical operations?

Two physical quantities P and Q have different dimensions. Which of the following mathematical operation is/are possible?

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 8xx3,

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 37-27,

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 5xx2

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16-:2,

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 9+4

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 72-:3,

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 4+5

Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 19-10,