4× + 10y=40 / 6x - 5y=20 /x+5y=14 / 8x + 6y=10 / 5x + 3y=40 / 9x +2y =35 / 2x + 4y=30 /-x 3y=20​

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Will mark brainliest for correct answer! i have been on this problem for an hour and can't find the answer. i'm begging here! incase you cant read the instructions in the picture because of too much or too little lighting: note: enter your answer and show all the steps that you use to solve this problem in the space provided.write a list of steps that are needed to find the measure of b. provide all steps as clear as possible, !

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?