the tens digit of a two digit number is twice the ones digit. If the digits are reversed, the new number is 36 less than the original number. Find the number. Pls Help!!

Question

the tens digit of a two digit number is twice the ones digit. If the digits are reversed, the new number is 36 less than the original number. Find the number.

Answer 1

original number is 84. switch the digits and 48 is 36 less than 84

48+36 = 84

T=2U, where T = the tens' digit and U = the unit's digit

10U+T = 10T+U-36

9U = 9T -36

divide by 9

U = T -4

U=2U-4

U=4

T = 8

original number is TU = 84