There are 10-pound weights and 40-pound weights and the total weight of the set is 850 pounds.
The given equation is:
We know that 850 represents the total weight of the set. Thus:
10n represents a weight, and 40(12) also represents a weight.
The term 40(12) in the equation, tells us that there are twelve 40-pound weights and 40(12) is the weight of those 12 weights.
The term 10n in the equation, tells us that there are "n" 10-pound weights, and 10n is the total weight of those n 10-pound weights.
When we find the solution for "n" we will have found the number to 10-pound weights in the set.
Answer:
The number of 10 lb weights in the set