Question 571632
solving the equations algebraically ___ p + d = 15 and p + 10d = 80


subtracting the equations ___ p + 10d - (p + d) = 80 - 15 ___ 9d = 65 ___ d = 7 2/9
___ this would make p equal to ___ 15 - 7 2/9 or 7 7/9


since these "fractional" coins do not exist ; there seems to be an inconsistency in the problem