Question

Caroline starts with $20 in her piggy bank. Each week she adds $4 to the piggy bank. After how many weeks will Caroline have more than $100 in her bank?

Answer 1

first I calculate in how many weeks Caroline will get 80$
4$*20 weeks =80$
but Caroline had 20$ at the beginning which means in 20 weeks she will have collected 80$+ 20$= 100$
the answer is after 20 weeks Caroline will have more than 100$in her bank .

Answer 2

Caroline will need atleast 21 weeks to get a balance more than $100, or any number greater than 20 weeks.

Explanation:

Caroline starts with $20 in her piggy bank. Each week she adds $4 to the piggy bank.

Let the number of weeks she adds $4 to make more than $100, be x.

Equation forms:

`20+4x>100`

Solving for x;

`4x>100-20`

=>
`4x>80`

Dividing by 4 on both sides;

x > 20.

This means that Caroline will need atleast 21 weeks to get a balance more than $100, or any number greater than 20 weeks.