Which of the following interchanges of signs would make the given equation correct?

110 ÷ 20 + 5 × 13 - 9 = 153

If '+' means 'division', '-' means 'multiplication', '÷' means 'subtraction' and '×' means 'addition', then what is the value of the following expression?

805 + 23 ÷ 4 - 6 × 2

Select the set in which the numbers are NOT related in the same way as are the numbers of the following set.

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding/substracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

(5, 13, 16) 

(4, 11, 14)

If '+' means 'subtraction', '-' means 'multiplication', '÷' means 'addition' and '×' means 'division', then what is the value of the following expression?

26 - 13 + 144 × 18 ÷ 81