The sum of three numbers is 103 the second number is 8 less than the first the last number is 3 times the second number

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 (%)

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Express -5 2/5 as an improper fraction.