The food store business bought 100 kilograms of three kinds of candies at 20 yuan, 25 yuan and 30 yuan per kilogram, and the total income was 2570 yuan. It is known that the sale of candies at 25 yuan per kilogram and 30 yuan per kilogram makes a total of 1970 yuan. How many kilograms of candy sold at 25 yuan per kilogram?
食品店商务买出每千克位20元、25元、30元的三种糖果共100千克，共收入2570元．已知其中售出每千克25元和每千克30元的糖果共收入1970元．每千克25元的糖果售出了多少千克．
<gadget id="calculator">2_570 - 1_970</gadget>
<output>600</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<gadget id="calculator">100 - 30</gadget>
<output>70</output>

<gadget id="calculator">30 * 70</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 - 1_970</gadget>
<output>130</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<gadget id="calculator">130 / 5</gadget>
<output>26</output>

<result>26</result>