eff bought 5 oranges and 5 apples for a total of $7.70. Gene bought 5 oranges and 3 apples for a total of $6.40. What is the cost of each orange and each apple?

Question

anonymous · Answer

A. orange: $0.65; apple: $0.89
B. orange: $0.75; apple: $0.79
C. orange: $0.79; apple: $0.75
D. orange: $0.89; apple: $0.65

anonymous · Answer

I know it's not B.

campbell_st · Answer

well this is case of using simultaneous equations 

5o + 5a = 7.70
5o + 3a = 6.40
--------------
         2a = 1.30           If you subtract the equations you can eliminate o

then solving for a 

         a = 0.65

now substitute it into either equation to find the cost of 5 oranges

then calculate the cost of 1 orange