A ladder has rungs 25 cm apart length of lower rung is 45 cm it goes to decrease to goes to high and the rung is 25 cm at the top If the top and bottom rungs are 2.5 meter what is the length of wood require for the rungs
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Distance between the starting rung and the top most rung = 250 cm
Number of rungs in 250 cm with spacing of 25 cm = 250/25 = 10
Including the bottom most rung the total number of rungs on the ladder = 11
The length of rungs is an Arithmetic progression/series.
Sum of lengths of all 11 rungs = (1st term + last term)/2 * number of rungs
= (45+25)/2 * 11 = 385 cm
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