St. augustine grass can grow at the rate of 4 over 7 centimeter per week. how many weeks will it take the grass to grow 12 over 7 centimeters? explain your answer using words, and show your work using division of fractions. st. augustine grass can grow at the rate of 4 over 7 centimeter per week. how many weeks will it take the grass to grow 12 over 7 centimeters? explain your answer using words, and show your work using division of fractions. st. augustine grass can grow at the rate of 4 over 7 centimeter per week. how many weeks will it take the grass to grow 12 over 7 centimeters? explain your answer using words, and show your work using division of fractions.