Question 3 & 4

Question 3: A person has 180 pens out of which 9 are blue, What is percentage of blue pens ?

FPSC AD IB 2017



Solution:

This is question asking percentage of some pens from a collection of pens!

To solve this we should understand Percentage !

visit this link as well for percent formula

Lets suppose 9 is ‘x’ percent of 180

i-e

 9= \frac{x}{100}of 180

 \Rightarrow 9= \frac{x}{100}\times180

 \Rightarrow x= \frac{9\times 100}{180}\

 \Rightarrow x= 5 %

Question 4: A student got 68 marks, which are 85% of total marks. How many total marks are there ?

FPSC AD IB 2017

Solution:

Lets suppose total marks = x

Now because the boy got 68 or 85 % marks from total marks ‘x’

it means

68 is 85 % of x

we cam write it as ;

68 = 85 % of x

68 = \frac{85}{100} x

\Rightarrow x = \frac{68 \times 100}{85}

\Rightarrow x =80

So, total marks were 80

 

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