The three classes planted trees together. The number of trees planted by Class A accounts for 1/5 of the total number of trees, and the ratio of the number of trees planted by Class B to Class C is 5:3. It is known that class C planted 45 trees, how many trees were planted in total by the three classes?
三个班同学一起植树．甲班植树的棵数占总棵数的(1/5)，乙班和丙班植树棵数的比是5：3．已知丙班植树45棵，三个班一共植树多少棵？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(4/5) * (3/8)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">45 / (3/10)</gadget>
<output>150</output>

<result>150</result>