Respuesta :

3 websites. Use the ratio 420/105 = 12/x. Then cross multiply. You will get 1260 = 420x. Then divide 420 on both sides, and the answer would be 3.

Answer:

3

Step-by-step explanation:

105/7hrs

15/1hr

15/60min

0.25/per minute

0.25*12

= 3