On Sunday, Xiao Ming goes shopping with his mother in the supermarket; his mother spends (2/5) of the money she brought on buying fruits, and spends (1/3) the rest of the money on buying vegetables. After buying these things, there is still 20 yuan left Money, how much money did mother bring?
星期天，小明陪妈妈到超市购物；妈妈买水果花去了所带钱的(2/5)，买菜又花去了余下钱的(1/3)，买完这些东西后还剩下20元钱，妈妈带了多少元钱？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) * (1/3)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<result>50</result>