In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

aa _ aaa _ aaaa _ aaaa _ b

The series is aab / aaab / aaaab / aaaaab. Thus, the number of a`s is increasing by one in the successive sequence.

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

cccbb _ aa _ cc _ bbbaa _ c

The series is cc bbb aaa / ccc bbb aaa / c. Thus, the pattern ccc bbb aaa is repeated..

In following alphabet series , one term missing as shown by question mark . Choose missing term from options.

A, Z, X, B, V, T, C, R, ?, ?

The first, fourth and seventh letters are in alphabetical order. So, tenth letter would be the letter after C i.e. D. Also, the second and third letters are alternate and in reverse order and so are the fifth and sixth letters and the eighth and ninth letters.

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Jim who is 6 year old and his uncle Harry who is 27 year old have the same birthday. In how many years will Harry be twice as old as jim?

Let's X is year add in both age

Jim:X + 6

Harry: X + 27

When Harry be twice old jim.

2 (X + 6 )= X + 27

x = 15

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In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

_ abb _ _ bb _ a _ bbab _ ba

The series is babb / babb / babb / babb / babb / ba. Thus, the pattern babb is repeated..

In following questions, one term in number series is incorrect.

Find out the incorrect number

445, 221, 109, 46, 25, 11, 4

Find out the incorrect number

445, 221, 109, 46, 25, 11, 4

3 is subtracted from each number and the result is divided by 2 to obtain the next number of the series.

So , 46 is wrong and must be replaced by 109 - 3 / 2 i.e. 53..

If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11 ?

By hit and trial, we put x = 5 and y = 1 so that (3x + 7y) = (3 x 5 + 7 x 1) = 22, which is divisible by 11.

(4x + 6y) = ( 4 x 5 + 6 x 1) = 26, which is not divisible by 11;

(x + y + 4 ) = (5 + 1 + 4) = 10, which is not divisible by 11;

(9x + 4y) = (9 x 5 + 4 x 1) = 49, which is not divisible by 11;

(4x - 9y) = (4 x 5 - 9 x 1) = 11, which is divisible by 11.

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The sum of even numbers between 1 and 31 is:

Let Sn = (2 + 4 + 6 + ... + 30). This is an A.P. in which a = 2, d = 2 and l = 30

Let the number of terms be n. Then,

a + (n - 1)d = 30

2 + (n - 1) x 2 = 30

n = 15.

Sn =n/2(a + l)=15/2x (2 + 30) = (15 x 16) = 240.

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A can complete a work in 20 days. B can complete the same task in 15 days. B worked for 10 days and left the job. In how many days A alone can complete the work?

B:s 10 days work=(1/15)*10

=2/3

Remaining work=(1-2/3)=1/3

Now,1/20 work is done by A in 1 day.

Hence ,1/3 work is done by A in (20*1/3)=6.6

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