Given l || m || n, find the value of x

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base