An algebra problem by Favour A=Futbol4life

Algebra Level 3

There are 200 people in a room. 99% of the people are kids. How many kids must leave the room for 98% of the people to be kids?


The answer is 100.

Favour A=Futbol4life by Favour A=Futbol4life , 18, USA

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

1 solution

Abhay Tiwari
Apr 24, 2016

When a kid leaves The room, it not only changes the percentage of the Total number of kids, but also effects the total number of people in the room. Here the system is dynamic.
So, suppose x x kids leave the room due to which the kids become 98% of the total people.

Then: 198 − x 200 − x = 0.98 \frac{198-x}{200-x}=0.98 on solving we get x = 100 x=100 .

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Brilliant!!!!

Favour A=Futbol4life - 5 years, 1 month ago

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...