Which of the following equations have exactly one solution?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What does x = in this equation x+3+2x=x+5

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them