If x + y = 3 and x = 2y.. What is the value of x3 + y3?

A 19
B 18
C 27
D 9

Correct Answer: 9

দেওয়া আছে, x + y = 3 এবং x = 2y. → xy = 2 এখন আমরা জানি, x3 + y3  = (x + y)3   - 3xy(x + y33 - 3×2×3 [মান বসিয়ে] = 27 - 18 = 9
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