AnswersCommon Core Algebra I - MA3109 CRUnit Test — Unit testQuestion 20
20
QuizMultiple Choice

Unit Test — Unit test

Question 20 • Common Core Algebra I - MA3109 CR

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
3x – 10y = 50
B
3x = 50 – 10y
C
50 + 10y = 3y
D
50 + 3y = 10y

Explanation

The 3 lb weights contribute 3x pounds, and the 10 lb weights contribute 10y pounds. Since their combined weight is 50 lb, 3x + 10y = 50. Rearranging gives 3x = 50 − 10y, which is choice B.

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