For 1 2 A - A 9 = 4 8 the value of digit A is : 1. 6 2. 7 3. -1 4. none of these

A - 9 must give a number whose ones digit is 8. ⇒ A - 9 = 8, A - 9 = 18, A - 9 = 28, ............... ⇒ A = 8 + 9, A = 18 + 9, A = 28 + 9, ............... ⇒ A = 17, A = 27, A = 37, ............... ⇒ A = 7, as A is a digit. Hence, option 2 is the correct option.