Exponential form of 154034

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)