Xiao Ming and Xiao Hong sold popsicles to earn pocket money during the summer vacation, and they bought popsicles at the same price. Xiao Ming sells it at 6 yuan per 10 popsicles, and Xiao Hong sells it at 7 yuan per 12 popsicles. Assuming that they both sell the same amount, how many popsicles will they have to wait to sell, and Xiao Ming will earn 4 yuan more than Xiao Hong.
小明和小红暑假卖冰棒赚零花钱，他俩以相同的价格买来了冰棒．小明以每10个冰棒6元的价格出售，小红以每12个冰棒7元的价格出售．假设他俩售出的数目相同，请问要等售出多少个冰棒后，小明会比小红多赚4元．
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(3/5) - (7/12)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">4 / (1/60)</gadget>
<output>240</output>

<result>240</result>