Arithmetichard · Past Paper
If (3x+5y) : (3x-5y) = 7:3, find x:y.
A25:6
B6:25
C5:3
D3:5
✓ Correct Answer: A — 25:6
Using componendo and dividendo: 3x/5y = (7+3)/(7-3) = 10/4 = 5/2. x/y = (5/2)*(5/3) = 25/6.
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