Can anyone explain how this question is done! Thank you soo much!

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

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Item 1 solve for s. s+24=90 −114 −66 66 114