Question

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Answer 1

1) Total No.of students=150

   No.of students absent =25

   No.of students present=125

   Percentage of students absent=(25/150)×100‰

                                                =50/3‰

                                                =16.67‰(approx.)

   percentage of students present=(125/150)×100‰

                                                 =250/3 ‰

                                                 =83.33 ‰(approx.)

2) Total number of voters in the constituency =12000

  % voters who voted =60%

 Therefore,

 Number of people who voted =12000× 60/100

  =7200

3) Given:

A local cricket team played 20 matches in one season.

If it won 25% of them and lost rest. how many matches did it loose?

Solution:

Total no of matches = 20,

Win percentage = 25%.

Therefore 25% of 20 = 5

The number of matches lost = 20 – 5 = 15

Result:

The number of matches lost is 15.

4)In 1 gram of gold there is 0.25  grams of silver and 0.05 grams of copper.

So, The amount of gold in the mixture is  

G = 1 - ( 0.25 + 0.5 )

G = 1 - 0.3

G = 0.7

 So, There is 0.7 gram of gold, 0.25 grams of silver and 0.05 grams of copper.

The amount in percentage is

G% =  0.7 × 100 =70%

C% =  0.05 × 100= 5%

S%  =  0.25 × 100 = 25%

Therefore, The percentage of gold, silver and copper in every gram of gold is 70%,25% and 5%.

5) Let the number be x

Then 40% of x = 800

40/100 × x  = 800

4/10x = 800

x = 200

So the required answer is 2000

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