Question

A brick staircase has a total of 30 steps. The bottom step requires 100 bricks.Each successive step requires two bricks less than the previous step.
(1) How many bricks are required for the top most step?
(11) How many bricks are required to build the stair case?​

Answer 1

Answer:

(a) 200

(b) 260

Step-by-step explanation:

a brick stair has total steps=30 steps

the bottom steps require 100 bricks

a. 100×2 bricks=200 bricks required at the top step

b.100 bricks + 30 steps=130 steps × 2 bricks =260 bricks required to cover the total stair case