Thickness of Strata by Graphical Method

Based on the fact that “Higher the elevation of rock Younger will be the rock and vice versa”. Tell which among the following is the youngest rock and the oldest rock from the given contour map. The rocks are Limestone, Shale, Conglomerate, Sandstone
Which of the following statement is/are true regarding the following contour map
What is the possible index of the point “X” shown in the contour map below?
What is the highest index of the contour lines in the map shown below?
What can be said about the profile represented by the below contour map?