Question

and what is this A rock band has 5 members, and two fiths of the members play string instruments. Also, 0.4 of the members sing. Does the band have the same number of string instrument players as singers? explain.

Answer 1

String 2/5 of 5 = 5 X 2/5 or just 2
Singer 5 X 0.4 = 2

2=2
so yes they have the same number playing strings as singing as both have 2 players 

Answer 2

The key to this problem, and the whole reason for assigning it for practice, is
to remind you that "two fifths" and "0.4" are the same number. The answer to
the question is: " Of course ! "