the amounts of time that three secretaries worked on a special project are in the ratio of 2 to 3 to 5 . if they worked a combined total of 90 hours , how many hours did the secretary who worked the longest spend on the project ?
"10 x = 90 = > x = 9 therefore the secretary who worked the longest spent 9 x 5 = 45 hours on the project option ( c )"
multiply(divide(90, add(add(2, 3), 5)), 5)