The hundreds digit of my number is greater than the tens digit. the ones digit is less than the tens digit. what could my number be? write it in two ways.

Ibelieve the total for the tip could be $21.90

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

Idrk but i think u should figure out the n dia n then the units it will make it way more easier