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Answered on 10 Feb CBSE/Class 9/Mathematics

Muthu K.

Mathematics Teacher

1
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Lesson Posted 2 days ago CBSE/Class 9/Mathematics

MAXIMA AND MINIMA

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

QUESTION In a college, where every student follows at least one of the three activities- dance, music, or sports- 65% follow dance, 86% follow music, and 57% follow sports. What can be the maximum and minimum percentage of students who follow A) All three activities B) Exactly two activities ANSWER Here... read more

QUESTION

In a college, where every student follows at least one of the three activities- dance, music, or sports- 65% follow dance, 86% follow music, and 57% follow sports. What can be the maximum and minimum percentage of students who follow

A) All three activities
B) Exactly two activities

 

ANSWER

Here the sum of the three percentage figures is 208%, however since every students is involve in at least one of the three activities, the surplus count is 108%, accounted for by the people engaged in 2 or 3 activities.

A) Exactly 3 activities
Max -> 108% extra is accounted for by 54% ppl, taking 2 extra activities(Total of 3 activities)
Min -> I allocate a 2nd activity to each of the 100%, but I am still left with 8%, which must be born by 8% people having 3 activities

For B)
Max -> 92%, since in worst case scenario 8% ppl must be into all 3 activities
Min -> 0%, In case of 54% ppl being into all 3 activities, as shown in A (Part 1), we end up with 0% ppl being into exactly 2 activities

Max exactly 2 sets cannot be 100%, as total is 208%, we must have a minimum of 8% students who like all three activities, hence only a max of 92% remaining folks can like exactly 2 activities

If you assign all 100% people 2 activities, your total will be 200 and not 208%... Also dint we just conclude that 8% ppl minimum are into 3 activities, So at least these 8% ppl need to be excluded right?

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Asked on 08 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Explain why 7 ? 11 ? 13 + 13 and 7 ? 6 ? 5 ? 4 ? 3 ? 2 ? 1 + 5 are composite numbers.

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Answered on 02 Feb CBSE/Class 9/Mathematics

Basanti D.

Math magician

2/3pie r cube
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Answered on 01 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Esther Y

Length=16c.m Breadth=8c.m Area =l*b=16*8=128cm sq
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Answered 4 days ago CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Samar Singh

Mathematics Professor

Lateral surface area of cone=πrl =π×r×1 πr
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Answered on 16/12/2017 CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Lalit Gupta

Mathematician

120/200=3/5
Answers 6 Comments
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Answered on 06 Jan CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

If a coin is tossed for a certain number of times. How many times the coin was tossed, if the probability... read more
If a coin is tossed for a certain number of times. How many times the coin was tossed, if the probability of getting a head is 0.4 and it appeared up for 24 times? read less

Sandeep Malik

Math Magacian

60.
Answers 4 Comments
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