Mom bought 5 kilograms of oranges and 7 kilograms of apples and spent a total of 63.5 yuan. It is known that each kilogram of apples is 6.5 yuan more expensive than oranges. How much is it per kilogram of oranges?
妈妈买了5千克橘子和7千克苹果一共花了63.5元，已知每千克苹果比橘子贵6.5元．每千克橘子多少元？
<gadget id="calculator">6.5 * 7</gadget>
<output>45.5</output>

<gadget id="calculator">63.5 - 45.5</gadget>
<output>18</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">18 / 12</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>