Gisele trains 7 days per week for a biathlon. She covers a total of 20 miles cycling and running each day. Gisele cycles a total of 105 miles each week, and runs a certain number of miles per week. If she cycles the same number of miles each day and runs the same number of miles each day, the equation 1 seventh times open paren 105 plus r close paren is equal to 20 represents the situation. Which describes the solution, r , to this equation?
Answer
A
The solution is 35 , which represents the number of miles she runs each day.
B
The solution is 35 , which represents the number of miles she runs each week.
C
The solution is 5 , which represents the number of miles she runs each week.
D
The solution is 5 , which represents the number of miles she runs each day.
Explanation
Multiply both sides of (105 + r) ÷ 7 = 20 by 7 to get 105 + r = 140. Subtract 105, so r = 35. Since r is added to the 105 cycling miles for the week, it represents the number of miles Gisele runs each week.
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