Question

a ladder has rungs 25 CM apart length of lowest rung is 45 cm and it goes to decrease as goes to high and the rungs 25 CM at the top if the top and bottom rungs are 2.5 M apart what is the length of the wood required for the rungs?
​

Answer 1

Answer:

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

Step-by-step explanation: