Mr. Wang brought 800 yuan, 638 yuan was used to buy a computer, and 98 yuan was used to buy a printer. How much money is left? How many.
王老师带了800元钱，买一台电脑用去了638元，买一台打印机用去98元，还剩多少元？多少．
<gadget id="calculator">800 - 638 - 98</gadget>
<output>64</output>

<result>64</result>