Bob has some 10 lb weights and some 3 lb weights. Together, all his weights add up to 50 lbs. If x represents the number of 3 lb weights and y represents the number of 10 lb weights, which equation can be used to find the number of each type of weight Bob has?
A)3x – 10y = 50
B)3x = 50 – 10y
C)50 + 10y = 3y
D)50 + 3y = 10y
I think the correct answer from the choices listed above is option B. The equation that can be used to find the number of each type of weight Bob has would be 3x = 50 – 10y. 50 lbs represents the sum of the two weights. So, it should be two entities summing up to 50 pounds.
