SOLUTION: Hi the average mass of 3 bags A B C when they are full is 38kg. When all the items from A are taken out the average mass of the 3 bags is 30kg.the mass of the items from B and C

Question 1099546: Hi
the average mass of 3 bags A B C when they are full is 38kg. When all the items from A are taken out the average mass of the 3 bags is 30kg.the mass of the items from B and C is in the ratio of 7:3. If the mass of the items in B is 20kg heavier than the items in C, what is the total empty mass of the 3 bags.
thanks
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let m be the mass of the 3 bags empty.
Let A be the mass of the items in bag A and so on.

.
.

.
.
.

Substituting,

and

So then when ,

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