By how much peter is overweight he is 105 kg his aim is to lose 500 g per week if he manages this how many weeks will it be until he is 90 kg

Hello There!

105 - 90 = 15kg
500g = 1/2 kg
Peter is 15kg overweight.
15 x 2 = 30
It will take him 30 weeks for this.

Hope This Helps You!
Good Luck :)

First I would turn 500g into kg and then set up an equation like the following.

So lets convert 500g to kg. We do this by using a conversion factor.
 

Now that we know this conversion factor lets set it up.



Ok now we know Peter wants to lose 0.5 kg or  a week.

Peter wants to lose 1/2 kg a week so we use x for weeks

Lost of weight per week 


Next, it tells us that Peter wants to be 90 kg. So he needs to lose 15kg. 
105 - 90 = 15kg

Now we need to find out how many weeks will it be untill he is 15kg. So, Lost of weight per week = 15kg


Now solve for x in 




So it will take 30 weeks at 1/2kg a week to lose 15kg