Question

Find the values of the letters in the following, and give reasons for the steps involved.

$A1$
$\underset{–}{+1B}$
$\underset{–}{B0}$

Answer 1

$A1+1B=B0,$

$numbersinthetenspositionaremultipliedby10whenwebreakthenumber$

$(10A+1)+(10+B)=10B+0$

$1+B=0,B=-1,notpossible$

$1+B=10$

$B=9$

$(10A+1)+(10+9)=(90+0)$

$10A=70$

$A=7$