Question

please Solve my question-13​

Answer 1

Answer:

$3x + 2y = 20 \\ cubing \: both \: sides \\ {(3x + 2y)}^{3} = {20}^{3} \\ {27x}^{3} + {8y}^{3} + 3(3x)(2y)(3x + 2y) = 8000 \\ {27x}^{3} + {8y}^{3} + 18 \times \frac{14}{9} \times 20 = 8000\\ {27x}^{3} + {8y}^{3} = 8000 - 560 = 7440$