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.
答
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.