Question

Good Morning everyone. This is my Question ❓. I can't understand from 4th line. can anyone explain me how it come. ​

Answer 1

$\frac{35 + 10k + 120 + 80 + 125}{7 + k + 8 + 4 + 5} = 14 \\ \\ \frac{360 + 10k}{24 + k} = 14 \\ \\ 360 + 10k = 14(24 + k) \\ \\ 360 + 10k = 336 + 14k \\ \\ 4k = 24 \\ \\ \bf \: k = 6$

Answer 2

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OK the solution is little twist. So. It may help you

Thank you ♥•♥•♥•