Question

80% of 50 students are interested in Mathematics. How many are not interested in mathematics? i. 30 ii. 10 iii. 20 iv.40 ∴with explanation answer correctly . correct and fast answers will be market branlist, wrong answers will be reported

Answer 1

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GIVEN

80% of 50 students are interested in Mathematics

TO CHOOSE THE CORRECT OPTION

The number of students are not interested in Mathematics

i. 30

ii. 10

iii. 20

iv. 40

CONCEPT TO BE IMPLEMENTED

A percentage is defined as a fraction of an amount expressed as a particular number of hundredths of that amount.

In order to calculate x % of y we write it as

$= \displaystyle \sf{y \times \frac{x}{100} = \frac{xy}{100} \: }$

CALCULATION

Here the total number of students = 50

Now it is mentioned that 80% of 50 students are interested in Mathematics

So the number of students interested in Mathematics

$= \displaystyle \sf{50 \times \frac{80}{100} }$

$\sf{ = 40\: }$

Hence the number of students are not interested in Mathematics = 50 - 40 = 10

So the correct option is - ii. 10

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Answer 2

Answer:

GIVEN

80% of 50 students are interested in Mathematics

TO CHOOSE THE CORRECTOPTION

The number of students are not interested in Mathematics

i. 30

ii. 10

iii. 20

iv. 40

CONCEPT TO BEIMPLEMENTED

A percentage is defined as a fraction of an amount expressed as a particular number of hundredths of that amount.

In order to calculate x % of y we write it as

= \displaystyle \sf{y \times \frac{x}{100} = \frac{xy}{100} \: }=y×100x=100xy

CALCULATION

Here the total number of students = 50

Now it is mentioned that 80% of 50 students are interested in Mathematics

So the number of students interested in Mathematics

= \displaystyle \sf{50 \times \frac{80}{100} }=50×10080

\sf{ = 40\: }=40

Hence the number of students are not interested in Mathematics = 50- 40 = 10

So the correct option is - ll) 10