Answer:
Let x = total number of people at the concert
number of men = (2/5)x
number of children = (2/5)x - 45
number of women = 3[(2/5)x - 45]
Then, (2/5)x + (2/5)x - 45 + 3[(2/5)x - 45] = x
(2/5)x + (2/5)x - 45 + (6/5)x - 135 = x
2x -180 = x
x = 180
Step-by-step explanation:
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