In order to sell a commercial house, the real estate sales company planned to install 101 billboards on the side of Wan'an South Road for publicity, and the distance between the two billboards was 4 meters. Now because of the need to save publicity costs, only 26 pieces are installed (the signs at both ends do not change), how many meters should the interval be changed? (Both ends are also installed)
房产销售公司为销售一处商品房，打算在万安南路一侧安装101块广告牌举行宣传，两块广告牌间隔4米．现在因为需要节约宣传费用，改为只安装26块(两端的牌子不动)，间隔应该改为多少米？(两端也要安装)
<gadget id="calculator">101 - 1</gadget>
<output>100</output>

<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<gadget id="calculator">26 - 1</gadget>
<output>25</output>

<gadget id="calculator">400 / 25</gadget>
<output>16</output>

<result>16</result>