25
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With a rectangular prism with these dimensions, you'd have 2 sides with an area of 15*5, two sides with an area of 5*4 and two sides with an area of 4*15. The surface area is 15*5+15*5+5*4+5*4+4*15+4*15 = 310.
4/5 - 8/15 = 12/15 - 8/15 = 4/15
3/5 ÷ 4/15 3/5 * 15/4 45/20 9/4■
4/15 * 9/5 = 4/5 * 3/5 = 12/25