A ladder has rungs 25 cm apart. The rungs decrease uniformly in le | Filo
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A ladder has rungs cm apart. The rungs decrease uniformly in length from cm at the bottom to cm at the top. If the top and the bottom rungs are  apart, what is the length of the wood required for the rungs

Solution:
It is given that the rungs are cm apart and the top and bottom rungs are  m apart. 

the total number of rungs.



Now, as the lengths of the rungs decrease uniformly, they will be in an A.P.

The length of the wood required for the rungs equals the sum of all the terms of this A.P.

First term,

Last term,



cm

Therefore, the length of wood is cm
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