Question

A number is doubled and then decreased by 13. the result is 61. what is the ordinal number?

Answer 1

i would use the inverse operation.
61 divided by 2 plus 13 equals 43.5

Answer 2

let x be the number
x + x - 13 = 61
2x - 13 = 61
2x = 61 + 13
2x = 74
2x/2 = 74/2
x = 37