Two numbers at a ratio

If 1.5x = 0.04y, then find the value of
{(y - x)/(y + x)}.

Correct answer:

w =  73/77

Step-by-step explanation:

1.5x = 0.04y y = 1.5/0.04 x = 37.5 x  w = y+xyx w = 37.5 x+x37.5 xx  w=37.5+137.51=7773=0.9481

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