-5
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■
Swahili
Oh, dude, it's like a math puzzle, right? So, if you look at the pattern, it's adding 4, then 4 again, then 6... oh wait, that doesn't fit. Hmm, maybe it's just a random series and the next number is whatever you want it to be. Who needs rules anyway, am I right?
(15/4) / (6/5) = (15/4) * (5/6) = (15*5)/(4*6) = 25/8
1/2, 2/3. 3/4, 4/5, 5/6 1/2 of 60 = 30 2/3 of 30 = 20 3/4 of 20 = 15 4/5 of 15 = 12 5/6 of 12 = 10 The next number is 10
-5
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.
5/9 ÷ 15/4 = 5/9 x 4/15 = 4/27
25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
4/5 - 8/15 = 12/15 - 8/15 = 4/15
As of November 15, 2009 there is no series five.
The series 1 6 10 13 15 (1+5=6; 6+4=10, 10+3=13; 13+2=15) is completed by 15+1=16. The answer is 16.
75/5 = 15 15*4 = 60 4/5 of 75 is 60.
3/5 ÷ 4/15 3/5 * 15/4 45/20 9/4■