Li Ming goes to the store to buy a box of flower balls and a box of white balls, both boxes of balls are equal in quantity. The original price of flower balls is 1 yuan for 2 pieces, and the original price of white balls is 1 yuan for 3 pieces. The price is reduced during the festival, and the price of the two balls is 2 yuan for 5 balls. As a result, Li Ming spent 4 yuan less, so how many balls did he buy in total?
李明到商店买一盒花球，一盒白球，两盒球的数量相等．花球原价是1元钱2个，白球原价是1元钱3个．节日降价，两种球的售价都是2元钱5个，结果李明少花了4元钱，那么他共买了多少个球．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 2</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/3) - (4/5)</gadget>
<output>-7/15 = around -0.466667</output>

<gadget id="calculator">(1/2) + (-7/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">4 / (1/30)</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<result>240</result>