Question

Dina climbs up 5 stairs every second and then climbs down two stairs over the next second how many seconds will she take to climb 60 stairs

Answer 1

hiiii friend
here is your answer
as the girl Dina climbs 5 stairs up in one second and then goes 2 stairs down in one second.
so, she climbs 3 stairs up in 2 seconds
and hence it will take 40 seconds to Dina to climb 60 stairs


glad to help you
hope it helps
thank you.

Answer 2

Stairs climbed up every second= 5
Stairs climbed down every second= 2

Let's take a pattern:

1st Second= 5-2 =3
2nd Second= 3+5-2 =6
3rd Second= 6+5-2 =9

As you see we have formed a pattern right here. Every second, it's a multiple of 3.

So now follow. We have to divide 60 by 3

$60 \div 3 = 20$

Therefore she will take 20 seconds.