Question

A number is decreased by 70% to 120. What is the original amount?

Answer 1

$400

Explanation:

Given: A number is decreased by 70% to 120.

Lets assume the original number be "x".

∴ Forming an equation to show number decrease to 120.

⇒
`x-70\% * x= 120`

Now solving it to find the value of x

⇒
`x-0.70x= 120`

⇒
`0.3x= 120`

Dividing both side by 0.3

⇒
`x= (120)/(0.3)`

∴
`x= 400`

Hence, The original amount is $400.