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plz explain i cant get it A ladder has rungs 25 cm apart. (see Fig. 5.7). The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and the bottom rungs are 1 2 2 m apart, what is the length of the wood required for the rungs? [Hint : Number of rungs = 250 25 ]
Asked by Diya | 23 Feb, 2018, 04:52: PM
answered-by-expert Expert Answer
begin mathsize 16px style the space top space and space bottom space rungs space should space be space 250 straight m space apart space instead space of space 122 straight m space please space check space other space wise space hint space will space not space be space valid so space now space rungs space are space 25 space mts space apart so space number space of space rungs straight n equals 250 over 25 equals 10 straight a equals 25 last space equals 45 it space is space in space ap space...... uniform space decrease total space length space means space sum space of space AP straight S subscript straight n equals 10 over 2 open parentheses 25 plus 45 close parentheses...... straight S subscript straight n equals straight n over 2 open parentheses straight a plus straight l close parentheses solve end stylebegin mathsize 16px style the space top space and space bottom space rungs space should space be space 250 straight m space apart space instead space of space 122 straight m space please space check space other space wise space hint space will space not space be space valid so space now space rungs space are space 25 space mts space apart so space number space of space rungs straight n equals 250 over 25 equals 10 straight a equals 25 last space equals 45 it space is space in space ap space...... uniform space decrease total space length space means space sum space of space AP straight S subscript straight n equals 10 over 2 open parentheses 25 plus 45 close parentheses...... straight S subscript straight n equals straight n over 2 open parentheses straight a plus straight l close parentheses solve end style
Answered by Arun | 23 Feb, 2018, 05:40: PM

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