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self Math Questions and Answer Page 327

(#M40001316) SELF QUESTION Keep an EYE

Find the number of zeroes at the end of 50!

suneil (14 years ago)

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(#M40001315) SELF QUESTION Keep an EYE

Ram was asked to multiply a number by 441 and he came with an answer 70229. His
Teacher told him that all the digits except the 2’s in his answer are correct. Which of the following could be the correct answer?

Solution

441*158 = 69678
441*159 = 70119
441*160 = 70560
441*161 = 71001
since all the digits except 2 are correct , second number will be 159 and answer = 70119


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suneil (14 years ago)

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(#M40001314) SELF QUESTION Keep an EYE

If abc = ab^3 = 180 where a, b and c are positive integers, what is the value of `c’?

Solution

abc = a(b^3) = 180
on solving abc = a(b^3) we get c = b^2
and for a(b^3) = 180 , there is only one possibility a = 180 and b = 1 so c = 1^2 = 1

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suneil (14 years ago)

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(#M40001313) SELF QUESTION Keep an EYE

Find the Unit’s digit in the product (76^41) * (41^14) * (14^87) * (87^76)

Solution

units digit of 87^76 = 1 because 87^3n+1 has units place as 1
units digit of 14^87 = 4 because 14^(some odd no.) has units place as 4
units digit of 41^14 = 1 because 41^(some even no. )has units place as 1
units digit of 76^41 = 6 because 76^(any positive no.)has units place as 6
so , units digit of the product is = " 4 " (units digit of 1*4*1*6)
Answer of ATMAKURI JAGADISH is correct except one mistake

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suneil (14 years ago)

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(#M40001284) SELF QUESTION Keep an EYE

smallest three digit prime number is ?
(a)103 (b)107 (c)109 (d)none of these

kapil (14 years ago)

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(#M40001283) SELF QUESTION Keep an EYE

Unit place digit in
7^104 is ?

kapil (14 years ago)

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(#M40001279) SELF QUESTION A matter of time Keep an EYE

Five minutes ago if it was four times as many minutes past three o'clock, how many minutes is is to six o'clock

Ravi B Mali (14 years ago)

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(#M40001268) SELF QUESTION At the store Keep an EYE

I entered a store and spent one-half the money that was in my purse. When I came out I found that I had just as many paise as I had rupees and half as many rupees as I had paise when I went in.
How much money did I have,with me when I entered?

Solution

From the given problem, it becomes clear that you have an odd number rupee with an even no. paisa
Let total rupee you had at the time of entering is x+1 and paisa is y,here x and y are even no.
according to the given condition
You had spent half money so remaining money you had will be x/2 rupee and 50+(y/2)paisa
so 50+(y/2) = x+1
and x/2 = 1/2(y) on solving we have x = 98 and y = 98 so amount would be 99 rupee and 98 paisa. thats it

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Ravi B Mali (14 years ago)

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(#M40001191) SELF QUESTION Keep an EYE

Instead of multiplying a number by 7, the number is divided by 7. What is the percentage of error
obtained ?

atashi (14 years ago)

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(#M40001178) SELF QUESTION tell the no. of coins Keep an EYE

We should have 100 number of coins as well as it should be for a total of rs.100 and all should be coins and there should not be any 1 rupee coin

PADMASHREE (14 years ago)

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