Q21: The following consecutive readings were taken with a level on continuously sloping ground at a common interval of 20 m. The last station has an elevation of 155.272 m. 0.420, 1.115, 2.265, 2.900, 3.615, 0.535, 1.470, 2.815, 3.505, 4.445, 0.605, 1.925, 2.885. Calculate: the reduced levels of the points by rise and fall method, the gradient of the line joining the first and last points, and the reduced levels of the points by the height of collimation method. Q22: Given the following data in Table below, determine the R.L.s of the points 1 to 6. If an uniform upward gradient of 1 in 20 starts at point 1, having elevation of 150 m, calculate the height of embankment and depth of cutting at all the points from 1 to 6.