Question

Jamal wants to mix concrete to lay a sidewalk. The instructions call for 2 parts cement, 4 parts sand and 3 parts gravel. He needs 270 L of concrete to complete his project. What ratio of cement to sand to gravel does he need to mix?


Select one:


a. 90 : 120 : 60

b. 60 : 90 : 120

c. 60 : 120 : 90

d. 120 : 60 : 90