Six friends hire a raft and guide to go white-water rafting in Colorado. Each person also buys a souvenir photo of the trip for $25.75. The total each person pays is $90.30. To find the cost c of the raft and guide, solve the equation c/6 + 25.75 = 90.30
c/6 = 90.30 - 25.75 = 64.55, c = $387.30
A student solved the equation x/4 + 5 = 1 without showing all the work. The student's solution of x = -1 is incorrect. What error did the student make?
the student multiplied x by 4 instead of dividing it by 4, x/4 = 1 - 5 = -4, x = -16 correct ans.