Arithmeticmedium · Past Paper
If $(x+y) : (x-y) = 4:1$, then $(x^2+y^2) : (x^2-y^2)$ is:
A17:8
B5:3
C16:1
D25:9
✓ Correct Answer: A — 17:8
(x+y)/(x-y) = 4/1 => x+y = 4x-4y => 5y = 3x => x/y = 5/3. Let x=5, y=3. (25+9)/(25-9) = 34/16 = 17/8.
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