12*5 is 60. So the hose was originally 60 feet.
Find a common denominator. The lowest one would come from you multiplying 2/5 by 4 on each side and 1/4 by 5 on each side. You are left with 8/20 and 5/20, added together would be 13/20.
A natural number is a counting number, it is like 1,2,3,4,5, etc
an integer is a natural number and also negative numbers and 0
so like -3,-2,-1,0,1,2,3
a natural number is always an integer
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