The ratio of apple trees to peach trees is 7:3. Workers sprayed 31 apple trees and 15 peach trees every day. A few days later, after spraying the peach trees, they found that there were still 24 apple trees left untreated. Spray. How many peach trees are there in the orchard?
苹果树与桃树棵树的比为7：3，工人每天给31棵苹果树和15棵桃树喷药，几天后，当给桃树喷完药时，发现苹果树还有24棵没有喷药．果园里有桃树多少棵．
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">15 * (7/3)</gadget>
<output>35</output>

<gadget id="calculator">35 - 31</gadget>
<output>4</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>