How do you know 72/80 is greater than 7/8?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent

What percent of 18 is 24? and plz explain thx.