A square pyramid is 8 m on each side. The surface area is 240 m2. What is the slant height

Please help

Is 240 the total surface area or the surface area of the lateral faces ??

If 240 the area of the 4 triangles:

60 = area of one triangle = 1/2*b*h where the base is 8 and the height is the slant height of the pyramid

120 = b*h
h = 120/b
h = 120/8 = 15 m
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If 240 the TOTAL surface area:

240 - 64 = 176, the area of 4 triangles

176/4 = area of one triangle with base = 8

44 = 1/2*b*h

88 = b*h

h = 88/b

h = 88/8 = 11 m

[Base Area] + 1/2 × Perimeter × [Slant Length], base area = 8 X 8 = 64m2

64m2 + 1/2 * 8m + 8m + 8m + 8m × [Slant Length] = 240m2

64m2 + 1/2 * 32m * [Slant Length] = 240m2

64m2 + 16m * [Slant Length] = 240m2

16m * [Slant Length] = 176m2

[Slant Length] = 176m2 / 16m = 11m

Let the slant height be h:
(8h)(4)/2 + 64=240
h=176/16= 11 m