A mix of 650 lb of cement/, 1300 lb of sand and 1700 lb of gravel is used gravel to pour one cubic yard of concrete how many lbs of gravel will be used to pour 6 cubic yards of concrete

I think the question is asking you to add the weights together to get a total, but if not it would only be 1700 x 6.

Otherwise, To find the number of pounds of mix needed for 6 cubic yards of concrete, you will need to find the weight of one cubic yard.

To find the weight of one cubic yard, you would add 650+1300+1700 together to get a total weight of 3650 pounds per cubic yard.

Then multiply 3650 by 6,

There will be 21900 pounds of concrete in 6 cubic yards.