x2 - 5x - 10 = 0
x2 - 20x + 360 = 0
x2 - 21x - 270 = 0
3x2 - 65x + 362 = 0
Correct answer is C
Tunde and Shola can do the work in 18 days.
Both will do the work in 118 days.
But Tunde can do the whole work in x days; Hence he does 1x of the work in 1 day.
Shola does the work in (x + 15) days; hence, he does 1x+15 of the work in 1 day.
1x+1x+15=118
2x+15x2+15x=118
x2+15x=36x+270
x2+15x−36x−270=0
x2−21x−270=0