Question

please tell me this answer

Answer 1

$\frac{x}{y} = \frac{x2}{y2 } \\ x = 560 \\ y = 7 \\ y2 = 5 \\ 560 \times 5 = x2 \times 7 \\ 2800 = x2 \times 7 \\ \frac{2800}{7} = x2 \\ 400 = x2$
400 worker will be needed to complete work in 5 months