Question. Tony paid $7 for 2 dozen apples and 1 bunch of bananas. Arnold paid $5 for 1 dozen apples and 1 bunch of bananas. How much does a bunch of bananas cost?
Answer. 3
What step-by-step reasoning justifies that answer?
Reasoning: Tony paid $7 - $5 = $2 more than Arnold. We know he bought the same number of bananas as Arnold but that he bought 2 - 1 = 1 dozen apples more than Arnold. Therefore a dozen apples should cost $2. If Arnold paid $5 and $2 for a dozen apples then the bunch of bananas cost $5 - $2 = $3.