Question

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

Answer 1

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Number of 3 lb weight = x

Number of 10 lb weight = y

Total weight = 50 lb

=> 3x + 10y = 50

To find the value of x:

3x + 10y = 50

3x = 50 - 10y

3x = 10(5 - y)

x = 10(5 - y)/3

To find the value of y:

3x + 10y = 50

10y = 50 - 3x

y = (50 - 3x)/10

ANSWER:
x = 10(5 - y)/3 and y = (50 - 3x)/10 are the two equations.



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Answer 2

Hope this helps.

A: 3x - 10y = 50 is the only right answer. B: not the right answer C:not the right answer D:not the right answer ether.