Three classes planted trees, class A planted 42 trees, class B planted 5/7 as many trees as class A, class C planted 3 trees less than class B (4/3) times, class C How many trees to plant?
三个班去植树，甲班植树42棵，乙班植树棵数是甲班的(5/7)，丙班植的棵树比乙班的(4/3)倍还少3棵，丙班植树多少棵？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">42 * (5/7) * (4/3)</gadget>
<output>40</output>

<gadget id="calculator">40 - 3</gadget>
<output>37</output>

<result>37</result>