How to find a inequality

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

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?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?