# Math Help - What is the formula that I will use in calculation ??

1. ## What is the formula that I will use in calculation ??

It has been found that in a small town number of uneducated people decrease each 5 year by 40% of the previous year ..

The number of uneducated people in 2005=70

Calculate number of uneducated people in 2010??

what is the formula that I will use?

Is it true that:

number of uneducated people in 2010=70*(40/100)=28

2. EDIT: Mistake is that you have calculated the decrease rather than the exact number ..

EDIT: Mistake is that you have calculated the decrease rather than the exact number ..

can you help me ,How can I calculate the decrease??

4. Originally Posted by change_for_better;296035[COLOR=black
][/COLOR]It has been found that in a small town number of uneducated people decrease each 5 year by 40% of the previous year ..

The number of uneducated people in 2005=70

Calculate number of uneducated people in 2010??

what is the formula that I will use?

Is it true that:

number of uneducated people in 2010=70*(40/100)=28

Is it true :

70*(40/100)=28

then

70-28=42

6. Originally Posted by change_for_better
Is it true :

70*(40/100)=28

then

70-28=42
Yes.