The sum of three numbers is 81. The first number is 6 more than the second. The third number is 3 times the second. What are the numbers?

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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 (%)