My last question any help is greatly appreciated!! (math)​

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

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 (%)