Cuizhu Village originally had 565 mu of peach orchards and 185 mu of pear orchards. Now it is planned to convert part of the pear orchards into peach orchards so that the area of peach orchards is four times the number of acres of pear orchards. Ask: How many mu of pear orchards should be converted into peach orchards?
翠竹村原有桃园565亩，梨园185亩，现计划把一部分梨园改成桃园，使桃园的亩数是梨园亩数的4倍，问：要把多少亩梨园改成桃园．
<gadget id="calculator">565 + 185</gadget>
<output>750</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">750 / 5</gadget>
<output>150</output>

<gadget id="calculator">185 - 150</gadget>
<output>35</output>

<result>35</result>