The city call fee of a certain mobile phone card has been reduced by a yuan/minute according to the original charging standard last time, and now it is reduced by 25%, so that the charging standard is b yuan/minute, then what is the original charging standard b+a
某种手机卡的市话费上次已按原收费标准降低了a元/分钟，现在又下调25%，使收费标准为b元/分钟，那么原收费标准为多少b+a
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>