Question

The sum of $2$ consecutive numbers is $89$ find the product of the numbers

Answer 1

Let the numbers be $x,x-1$

The sum is $89$

$x+x-1=89$
$2x-1=89$
$2x=90$
$x=45$

So the numbers are $45,44$

The product is $44\times 45=1980$