Question

Oh and no 5 too the last one

Answer 1

Hey Friend ✋✋✋

Let the cost of one box of paper clips be "x"

and index card be "y"

15x + 7y = 55.40.....× 2

12x + 10y = 61.70.... = 6x + 5y = 30.85.....×5

by eliminating

30x + 25y = 154.25
30x + 14y = 110.80 (-)
--------------------------
y = 43.45/11 = 3.95

y = 4(approx)

6x = 30.85 -19.75
x = 11.1/6 = 1.85 = 2(approx)


hope it helps