A kilogram of apples is 12 yuan, and the price of a kilogram of grapes is 3 yuan less than four times that of apples. How much is a kilogram of grapes?
一千克苹果12元，一千克提子的价格比苹果的4倍少3元，一千克提子多少元？
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 - 3</gadget>
<output>45</output>

<result>45</result>