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1. $x - y = 10$

A. 20
B. 20
C. 20
D. 20

Answer: Option B

Explanation:

x - y = 10 x^{3} - y^{3} = 1900 x y = ? x^{3} - y^{3} = {(x - y)}^{3} + 3 x y (x - y) 1900 = {(10)}^{3} + 3 x y . 10 1000 + 30 x y = 1900 30 x y = 1900 - 1000 30 x y = 900 x y = \frac{900}{30} x y = 30

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