Amix 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.