Please provide the answer for the x and z as seen in the image

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

What percent of the circle below is shaded?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling