A boy was asked to find the value of 7/12 of a sum of money. Instead of multiplying The sum by 7/12 he divided it by 7/12 and thus his answer exceeded the correct Answer By Rs.95. Find the correct answer.
In 1234,
Unit place 1 to 1234 can be formed using 0 to 9 digits. i.e., 10 digits.
10's can be formed using 0 to 9 digits. i.e., 10 digits.
100's can be formed using 0 to 9 digits. i.e., 10 digits.
1000's can be formed using only one digit, 1. i.e., 1 digit.
Total no. of numbers required is 10 + 10 + 10 + 1 = 31.
In 4321, it is 10 + 10 + 10 + 4 = 34.
Therefore, difference = 34-31=3.
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The minimum number of numbers required to form a number from 9 to 9000 which are multiples of 5 is:
The multiples of 5 must end with 0 or 5.
Therefore, units place of a number from 9 to 9000 can be filled by only two digits 0 and 5. i.e., 2 digits.
10's place of a number from 9 to 9000 can be formed by 0 to 9 digits. i.e., 10 digits.
100's place of a number from 9 to 9000 can be formed by 0 to 9 digits. i.e., 10 digits.
1000's place of a number from 9 to 9000 can be formed by by 1 to 9 digits 1. i.e., 9 digits.
Therefore, total number of numbers required is 2 + 10 + 10 + 9 = 31.
40,44,48 is divisible by 4.
not 42. hence d cannot be 2
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The mean of 100 abservations was calculated was 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is :
We have to find the minimum number of numbers required to form every number from 900 to 9,000.
Unit place of a number from 900 to 9,000 can be formed using 0 to 9 digits. i.e., 10 digits.
10's place of a number from 900 to 9,000 can be formed using 0 to 9 digits. i.e., 10 digits.
100's place of a number from 900 to 9,000 can be formed using 0 to 9 digits. i.e., 10 digits.
1000's place of a number from 900 to 9,000 can be formed using 1 to 9 digits. i.e., 9 digits.
Therefore, total number of numbers required is 10 + 10 + 10 + 9 = 39.
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In a group of cows and hens, the number of legs are 14 more than twice the number of heads. The number of cows is :
Lets assume no. of cows = x, and no. of hens = y.
So heads = (x+y)
Legs = (4x+2y)
As per condition:
4x+2y = 2(x+y)+ 14
2x = 14 => x = 7.
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Some people are standing square. From them 32 are removed and then form a small square and then 8 more removed. now we cannot form the square. So how many people are there at the beginning?
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