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A ladder has rungs 25cm apart. The rungs decrease uniformly in length from 45cm at the bottom to 25cm at the top. If the top and the bottom rungs are 2 1/2

m apart, what is the length of the wood required for the rungs?
hint.. Number of rungs=250/25+1




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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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