某数的5倍减去2.5除5的商,差得38,求某数.

问题描述:

某数的5倍减去2.5除5的商,差得38,求某数.

设这个数为x,
5x-5÷2.5=38,
     5x-2=38,
   5x-2+2=38+2,
        5x=40,
     5x÷5=40÷5,
         x=8.
答:这个数是8.