
p l e a s e h e l p !
p l e a s e h e l p !
let x be the number of days needed to complete with 10 students.
First equation,
x= k/10
k = 10x ——-(1)
Second equation,
x-3 = k/15 —–(2)
solve for x, sub 1 to 2
x = 9
sub x=9 into both equation,
you will get both k = 90
Now, solving the question, let y be the number of students needed to complete the project 4 days earlier. Sub x=9, k = 90
x-4 = k/y
y=18
The question ask the number of addition students
Hence ans is 8
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