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so uhm help please!

16500 rounded to the nearest whole numbe

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 (%)

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Ineed to know how to write question one in mathematical terms