Question

Jason started with d dollars in his piggy bank. One week late, Jason doubled the amount in his piggy bank. Another week later, jason was able to add $20 to his piggy bank. At this point, the piggy bank had $50 in it. What is d?

Answer 1

Given, Jason had an amount of $d in the piggy bank.

After one week, Jason doubled the amount in the piggy bank.

So, after one week the amount in the piggy bank = $
`(2)(d)` = $(2d)

Another week later, Jason added $20 in the piggy bank.

So after another week, the total amount in the piggy bank = $
`(2d+20)`

Given, that time the piggy bank had $50 in it.

So we can write the equation as,

`2d+20 = 50`

To find the value of d, we will move 20 to the right side by subtracting it from both sides. We will get,

`2d+20-20 = 50 - 20`

`2d = 50 -20`

`2d = 30`

Now to find d, we will move 2 to the right side by dividing it to both sides. We will get,

`(2d)/(2)=(30)/(2)`

`d = 15`

We have got the required answer.

The value of d = $15.