Respuesta :

40/100 x = 28
0.4x = 28
x = 28 / 0.4
x = 70
40% = 40/100 = 4/10 = 2/5

n × 40% = 28

*divide both sides by 40%

n = 28/(40%) = 28/(2/5) = 28/2 × 5 = 14 × 5 = 70

answer is . . . 70