Bob has some 10 lb weights and some 3 lb weights. Together, all his weights add up to 50 lb. 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?
Answer
A
3 x minus 10 y is equal to 50
B
50 plus 3 y is equal to 10 y
C
3 x is equal to 50 minus 10 y
D
50 plus 10 y is equal to 3 y
Explanation
The 3 lb weights contribute 3x pounds, and the 10 lb weights contribute 10y pounds. Together they weigh 50 pounds, so 3x + 10y = 50. Rearranging gives 3x = 50 − 10y, which is choice C.
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