Question: An 8-year old child wants to buy a toy car which costs $12. He already has $4 savings. How many days will it take him to save the remaining amount of money if he promises to save $2 daily from his allowance?
Find the solution. 
Answer: 
The boy still needs $12 - $4 = $8.
If he saves $2 per day then it will take him $8 / $2/day = 4 days to save the remaining amount.