The school held a "Welcome to the New Year" party, and the students bought colored balls to decorate the venue. Among them, red balls account for (2/5) of the total number. If red balls increase (1/8) and balls of other colors decrease by 15, then the number of red balls is equal to that of other colors. How many colored balls did you buy in total?
学校召开"迎新春"联欢会，同学们买来彩球布置会场．其中红球占总数的(2/5)，若红球增加(1/8)，其它颜色的球减少15只，则红球与其它颜色球的只数相等．一共买来彩球多少只？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(2/5) * (1/8)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (2/5) - (1/20) - (2/5)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">15 / (3/20)</gadget>
<output>100</output>

<result>100</result>