Question

How much material would be needed for the rungs of a ladder of 29 rungs, if the rungs taper uniformly from 18 inches to 30 inches

Answer 1

It would be 713 inches.

S31 = 31/z (18+28)

Answer 2

2784 inches

Explanation:

The amount of materials needed is the product of the number of rungs with the amount of materials required for one rung.

The amount of material required for one rung is the perimeter of the rung.

Perimeter of rung

= 2(18 + 30)

= 96 inches

Amount of material needed for the ladder

= 96 * 29

= 2784 inches