Question

Which equation will solve the following word problem? Bob spends an average of $66.42 per week at the grocery store. He spent $62.84 last week, and $71.02 this week. How much did Bob spend two weeks ago?
($66.42 +$62.84 + $71.02)/3 = S


S + $62.84 + $71.02/2 = $66.42


$66.42 +$62.84 + $71.02/3 = S


(S + $62.84 + $71.02)/3 = $66.42

Answer 1

The last equation will solve the word problem --> (S + $62.84 + $71.02)/3 = $66.42

Step-by-step explanation:

Data

Bob's expenditure in week 1: x

Bob's expenditure in week 2: $62.48

Bob's expenditure in week 3: $71.02

Bob's average expenditure: $66.42

Formula to calculate average:

Mean = $\frac{Sum of data}{Total number of data}$

Solution

Mean = $\frac{Sum of data}{Total number of data}$

66.42 = $\frac{x+62.48+71.02}{3}$

66.42*3 = x + 133.5

199.26 - 133.5 = x

x = 65.76

Therefore, Bob spent $65.76 two weeks ago.

The last equation will solve the word problem --> (S + $62.84 + $71.02)/3 = $66.42

Keyword: equation, average

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