# Thread: I need help with this math problem..

1. ## I need help with this math problem..

A planned building was going to be 100 feet long, 75 feet deep, and 30 feet high. The owner decides to increase the volume of the building by 10% without changing the dimensions of the depth and the height. What will be the new length of this building?

What do i do here?

2. Originally Posted by eh501
A planned building was going to be 100 feet long, 75 feet deep, and 30 feet high. The owner decides to increase the volume of the building by 10% without changing the dimensions of the depth and the height. What will be the new length of this building?

What do i do here?

$V=LWH$

$V=100*75*30 \Rightarrow 225000$

110% of volume is: $1.1V = 247500$

We want to change only the length of the building so: $247500=75*30*L$

I think you can solve the last part.

3. Wait why 110%?

4. Originally Posted by eh501
Wait why 110%?
Increasing by 10% means multiplying something by 110% or 1.1.

5. How many math problems can i post in one thread?

6. Originally Posted by eh501
How many math problems can i post in one thread?

7. Even if i have like 20 other questions? lol

8. Originally Posted by eh501
Even if i have like 20 other questions? lol
Yes, "lol." See rule #15 here.

-Dan