Question

how this 57=40+25-x please tell

Answer 1

$28.5 = 20 + \frac{25 - x}{2}$

$28.5 = \frac{2 * 20 + (25 - x)}{2}$

$28.5 = \frac{40 + (25 - x)}{2}$

$28.5 * 2 = 40 + (25 - x)$

57 = 40 + (25 - x)


Hope this helps!