at a certain bakery, each roll costs r cents and each doughnut costs d cents. if Alfredo bought rolls and doughnuts at the bakery, how many cents did he pay for each roll?
1) Alfredo paid $5 for 8 rolls and 6 doughnuts.
2) Alfredo would have paid $10 if he had bought 16 rolls and 12 doughnuts.
Clearly if you can find 2 ways to buy 8 rolls and 6 doughnuts with $5, both the answer will be E.
My first reaction was to equate $5 to 500 cents, and say 8x +6y = 500, to solve for x and y. i then broke 500 down to its primes, thinking that x and y would be found using those primes.
can someone shed light on the best way to find these values for x and y?
oa is e
1) Alfredo paid $5 for 8 rolls and 6 doughnuts.
2) Alfredo would have paid $10 if he had bought 16 rolls and 12 doughnuts.
Clearly if you can find 2 ways to buy 8 rolls and 6 doughnuts with $5, both the answer will be E.
My first reaction was to equate $5 to 500 cents, and say 8x +6y = 500, to solve for x and y. i then broke 500 down to its primes, thinking that x and y would be found using those primes.
can someone shed light on the best way to find these values for x and y?
oa is e
