Mr. Kardi have 5 trucks of sand . The charge then A and B are 2.5 ton , trucks C and D 3 ton , 1 ton truck E load over charge - average. How many tons of cargo trucks E ?

To find out how many tons of cargo truck E carries, we need to first determine the average cargo capacity of the trucks.

Let's calculate the average cargo capacity:

Total cargo capacity of A and B = 2.5 ton + 2.5 ton = 5 ton
Total cargo capacity of C and D = 3 ton + 3 ton = 6 ton

To find the average, we add up the total cargo capacity of trucks A, B, C, and D and divide it by the number of trucks.

Total cargo capacity = 5 ton + 6 ton = 11 ton
Number of trucks = 4 (A, B, C, D)

Average cargo capacity = Total cargo capacity / Number of trucks
= 11 ton / 4

Now, let's find the weight of truck E's load by calculating the difference between the average cargo capacity and the charges of the other trucks:

Truck E's load = Average cargo capacity - (Charges of A, B, C, D)
= 11 ton - (2.5 ton + 2.5 ton + 3 ton + 3 ton)
= 11 ton - 11 ton
= 0 ton

Therefore, based on the given information, truck E does not carry any cargo.