At a baseball game, a vender sold a combined total of 240 sodas and hot dogs. the number of sodas sold was two times the number of hot dogs sold. find the number of sodas and the number of hot dogs sold.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )