Step-by-step explanation:

A cube number is an integer which is a third power of another integer.
A triangular number is a number that counts the objects that can form equilateral triangle (sorry, I cribbed it a little from Wikipedia; it's difficult to explain). Just look at the picture.
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To find this out, divide 35 by 60:
35/60 = .583333333333
So 35 is 58.3% of 60.
Hope this helps!
2.5 is your answer because first we divide the numbers then subtract 2 from both sides and simplify