Question

if the product of two number is 81. one of them is 9. find the other number

Answer 1

Let the numbers be a and b
a×b=81 (given)
a=9
b=?
So , a×b=81
9×b=81 .
b=81/9
b=9
Therefore the other required number is 9 .

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Answer 2

let the unknown number be 'X'
$9 \times x = 81 \\ x = 81 \div 9 \\ x = 9$
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