Tens digit is the sum of tenths digit and thousandths digit?

The number is 84. Assign the digits in the number the letters a and b. GIVEN: a + b = 12 GIVEN: a = 2bSolve for b, then solve for a. 2b + b = 12 3b = 12 b = 4a = 2(4) = 8

91

You could be 22?2 + 2 = 42 x 2 = 4