Respuesta :

Answer:

12

Step-by-step explanation:

7x3=21

3x4=12

boOM

Hope This Helps

<3

Answer:

4 lawns were mowed in 7 hours, so if 7 x 3 = 21.

Then you can mow 12 lawns in 21 hours

4 lawns each 7 hours.

Step-by-step explanation: