You saw a shirt for $97. You didn’t have the cash, so you borrowed $50 from your mum and $50 from your dad = $100. You bought the shirt, and had $3 change. You gave your dad $1 and your mum $1 and kept the other $1 for yourself. Now you owe your mum $49 and your dad $49. 49+49 = 98 + your $1 = 99. Where is the missing $1?
Well… I’ll try and explain but this might not be crystal clear…
You borrow a total of $100, of which $97 is spent and $3 is change. You pay back $2 so now only owe $98. The value of the $97 shirt and your $1 left over is $98, which is equal to the debt of $49 to both parents. Think of it like balancing an equation.
$100 = $50 + $50 ^yours ^from parents
$97 + $3 = $50 + $50 ^shirt ^change
$97 + $1 = $49 + $49 ^paying $1 to each parent
$98 = value of your stuff $98 = value of borrowed money still owed :)
So the one dollar that is “missing" is actually just balanced incorrectly because the logic in the riddle has assumed the amount you owe + your change should equal $100 which is incorrect. This is because in the equation you can see that what you owe is on a different side of the equals than your change. You’ve paid off $2 of the debt already! so you have a $98 debt, a $97 shirt and $1 change.