If ba= 7x+4 and co= 10x-11 then what is x?

Sum is 17 and their difference is 3

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41