The unit price ratio of apples and oranges is 3:7, and the mass ratio is 5:4. The total cost is 430 yuan. How much does the apple cost?
苹果与橘子单价比为3：7，质量比为5：4，共花430元，苹果花了多少元？
<gadget id="calculator">15 + 28</gadget>
<output>43</output>

<gadget id="calculator">15 / 43</gadget>
<output>15/43 = around 0.348837</output>

<gadget id="calculator">430 * (15/43)</gadget>
<output>150</output>

<result>150</result>