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A ladder has rungs 25cm apart …

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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 bottom rungs are 5/2 m apart what is the length of the wood required for the rungs

    • Posted by Divya Sharma 7 years, 11 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Monal Kapse 7 years, 11 months ago

    Dist. Between 2 rungs =25 cm Total length = 5/2 m So convert cm into m =5/2* 100 = 250 m Lenght of 1st rung= 45 cm No. Of rungs are = 250/25+1 We will get = 11 Rung increase from 25 to 45. AP will be 25............ 45 a=25 , l = 45 , no. Of rungs=11 So, S=n/2(n+l) =11/2(45+25) =11/2(70) =385cm So length of wood required will be 385 cm for the rungs.

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