Question

A house has steps outside it. A boy is standing on the lowest step (i.e., first step). The roof is at the 21th step. He moves 5 steps up and then moves back 3 steps down.
In how many moves will he reach the roof ?
A/15
B/17
C/12
D/10​

Answer 1

Answer:

17 id the correct answers for these

Answer 2

Answer:

The correct option is D) $10$

Step-by-step explanation:

Given: There are steps outside a house. On the bottom step, a young boy is present (i.e., first step). The $21st$ step is where the roof is. He ascends five steps, then descends three steps afterward.

To find: How many steps will it take him to reach the roof?

Solution:

He moves $5$ steps up and down then moves back 3 steps and he up $8*2=16$ steps.

In next moves he up $16+5=21$ steps.

So, move $9$ steps he up $21$ steps but again $3$ steps down.

So, he up 21 steps $9+1=10$ moves.

Hence, D) $10$ is the right answer.

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