The unit price of Chinese books is 6 yuan each, and each math book is x yuan. The school ships 120 Chinese books and 120 math books each. How much should it be in total?
语文书的单价是每本6元，数学书每本x元，学校运来语文书和数学书各120本，一共应多少元．
<gadget id="calculator">720 + 120</gadget>
<output>840</output>

<result>840</result>