Respuesta :

Answer: 22.5

Step-by-step explanation:

The formula for.direct proportion will be:.

y = kx

Since y = 45, x = 180

45 = 180k

k = 45/180

k = 1/4 = 0.25

When x = 90

Since y = kx

y = 0.25 × 90

y = 22.5