18
Chat with our AI personalities
Add -3 to 9 because 9+(-3) = 6 Alternatively add s to the Roman numeral of ix which is 9 which then becomes six.
you need to add +9 +9-7 = +2
They add up to 9
add 9 add 1 subtract 20 add 9 add 1
They also add up to a multiple of 9.