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 $\frac{20}{100}$

$\text { Present cholesterol level }=320-\frac{20}{100} \times 320$

$\begin{array}{l}{=320-\frac{1}{5} \times 320} \\\\ {=320-64=256}\end{array}$

Hence, at present cholesterol level is 256