Question

Brian has reduced his cholesterol level by 20% after his last check up. If his original level was 320, what is his cholesterol level

now?

Answer 1

The present cholesterol level of Brian is 256

Solution:

Given that, Brian has reduced his cholesterol level by 20% after his last check up.

His original level was 320

We have to find what is his cholesterol level now?

The present cholestrol level is given as:

present cholesterol level = previous cholesterol level – change percentage x previous cholesterol level

So, present cholesterol level = 320 – 20% of 320

20% can be written in fraction as
`(20)/(100)`

`\text { Present cholesterol level }=320-(20)/(100) * 320`

`\begin{array}{l}{=320-(1)/(5) * 320} \\\\ {=320-64=256}\end{array}`

Hence, at present cholesterol level is 256