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Playing with Numbers — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSPlaying with Numbers3 Marks
Question
$A1+1B=B0$
✓

Answer

$B = 9$ as $9 + 1 = 10.$
We want $0$ at units place and $1$ is carry over.
Now $B - 1 -1 = A.$
$\therefore A = 9 - 2 = 7$
Hence$ A + 7$ and $B = 9$
$71+19=90$

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