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Frequently Asked BOOK Math Questions and Answer Page 19

(#M40021114) BOOK QUESTION Keep an EYE

9 examiners can examine a certain number of answer books in 12 days by working 5 hours a day. How many hours in a day should 4 examiners work to examine twice the number of answer books in 30 days?

Asked In Book Abhishek (12 years ago)

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(#M40022931) BOOK QUESTION area Keep an EYE

A sperical ball of radius 7cm is kept on the floor. It is to be covered by a right cylinder open at one end. Find the volume and the surface area of the cylinder if the cylinder just covers the ball

Asked In Book Harsh Poddar (12 years ago)

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(#M40151547) BOOK QUESTION Aptitude Keep an EYE

Q:- The number of values of r satisfying the equation 39C3r-1 -39Cr^2=39Cr^2 -1 -39C3r is
a)1
b)2
c)3
d)4

Asked In Book Alekhya Vakulabharanam (10 years ago)

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(#M40035928) BOOK QUESTION Keep an EYE

A pool measuring 10 meters by 20 meters is surrounded by a path of uniform width. If the area of the pool and the path combined is 600 square meters, what is the width of the path?
Thank you

Asked In Book (11 years ago)

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(#M40013320) BOOK QUESTION Proportion Keep an EYE

If 20 men can build a wall 56 meters long in 6 days, what length of a similar wall can be built by 35 men in 3 days ?

Asked In Book Ratan Lal Jat (13 years ago)

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(#M40152697) BOOK QUESTION averages Keep an EYE

the average expenditure of a man in the first five months is rs.12000 and for the rest months is rs.13000.if his savings amount to rs.29000, his average monthly income is?

Asked In Book swathi choda (10 years ago)

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(#M40000151) BOOK QUESTION Keep an EYE

There are 9 coins. Out of which one is odd one i.e weight is less or more. How many iterations of weighing are required to find odd coin?

Solution

It requires a maximum of 4 weighings. Divide the 9 balls into sets of 3 each. Let them be set1, set2 and set3. Weigh set1 and set2 against each other. If they weigh equal, then set3 contains odd coin. Otherwise, weigh set1 against set3. If they weigh equal, set2 contains odd coin. If in both cases, they do not weigh equal, then set1 contains odd coin. Now, we have identified set with defective coin in maximum 2 weighings. Repeat this process on individual coins of the found set. This requires a max of 2 more weighings. Hence, the odd coin can be found in a maximum of 4 weighings at all times.
This answer is given by TIJO JOSE and is right

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Asked In Book Naveen (15 years ago)

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(#M40152793) BOOK QUESTION Keep an EYE

If both 11^2 & 3^3 are factors of the number ax4^3x6^6x13^11, then what is the smallest possible value of a?
a.121
b.3267
c.363
d.33

Asked In Book J.Aparna (10 years ago)

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(#M40020010) BOOK QUESTION number series Keep an EYE

1,2,5,14,41,?

Asked In Book Gokul Krishnan (12 years ago)

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(#M40153718) BOOK QUESTION Venn diagrams Keep an EYE

In a certain school, there are 180 pupils in Year 7. One hundred and ten pupils study
French, 88 study German and 65 study Indonesian. Forty pupils study both French and
German, 38 study German and German only. Find the number of pupils who study:
a.all three languages
b.Indonesian only
c.none of the languages
d.at least one language
e.either one ot two of the three languages.

Asked In Book Uma Devi Palla (10 years ago)

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