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Question
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 5/2 m apart . What is the length of the wood required for the rungs ??
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Solution
DISTANCE BETWEEN FIRST AND LAST RUNGS=2.5m=250cm
DISTANCE BETWEEN FIRST AND SECOND RUNGS=25cm
NUMBER OF RUNGS=250/25+1=11 RUNGS
So length of wood = Sn = n/2 (a + l )
=11/2 (45+25 )
=11/2 (70)
=385 cm
DISTANCE BETWEEN FIRST AND LAST RUNGS=2.5m=250cm
DISTANCE BETWEEN FIRST AND SECOND RUNGS=25cm
NUMBER OF RUNGS=250/25+1=11 RUNGS
So length of wood = Sn = n/2 (a + l )
=11/2 (45+25 )
=11/2 (70)
=385 cm
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m apart, what is the length of the wood required for the rungs?
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