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(x-y)=5 , x² -y² =55 ആയാൽ y യുടെ വില എന്ത്?

A8

B3

C5

D7

Answer:

B. 3

Read Explanation:

x-y=5 , x²-y²= 55 → (x+y)(x-y)=55 (x+y) × 5 = 55 x+y = 11 y = {(x+y) - (x-y)}/2 = {11-5}/2 = 6/2 =3

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