Question

bruce bought two books.one book costs $4.00 more than three times the other.together the two books cost him $72

Answer 1

let the one book cost be X then the other book cost 3X+4
A/Q. X+3X+4=72
4X = 72-4
4X= 68
X =68/4=17
The first book cost is 17 & second book cost 17*3+4=55

Answer 2

x +3x+4=72 . 4x=68. x=17. 4x= 68 I hope it can help u