Question

please solve these fastly

Answer 1

18. Let one place no. be x.
Tenth place no. =12 - x
Original no. = 10(12-x) + x
= 120 - 10x +x
= 120 - 9x
Interchanged no. = 10(x) + 12 -x
= 10x + 12 -x
= 9x + 12
Atq,
( Interchanged no. ) - ( Original no.) =36
=> (9x + 12) - (120 - 9x) = 36
=> 9x + 12 - 120 + 9x = 36
=> 18x - 108 = 36
=> 18x = 36 + 108
=> 18x = 144
=> x = 144/ 18
=> x = 8
Original no. = 120 - 9x
= 120 - 9 × 8
= 120 - 72
= 48 Ans