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

Find out the incorrect number

3, 7, 15, 39, 63, 127, 255, 511

Find out the incorrect number

3, 7, 15, 39, 63, 127, 255, 511

Each number in the series is multiplied by 2 and the result increased by 1 to obtain the next number.

So, 39 is wrong and should be replaced bu (15 * 2 + 1) i.e. 31..

In the division calculation 952 473 Ã· 18, which two adjacent digits should be swapped in order to increase the result by 100?

If after division by 18 the number has to be increased by 100, then before the division it needs to be increased by 18 Ã— 100 = 1800. So we need to find two adjacent digits in the number 952 473 which when swapped increase it by 1800. If 952 473 is increased by 1800 it becomes 952 473 + 1 800 = 954 273. We obtain 954 273 from 952 473 by swapping the adjacent digits 2 and 4.

.
The ratio of Two Sisters Alice and Betty is 3/2. However if the age of Alice before 15 years and that of Betty after 15 years than the original ratio is reserved. What is the age of Betty?

Let

Alice age's= A and Betty Age's=B

Given that

A / b = 3 / 2

2 A= 3 B

2A-3B=0.......(1)

And also given that

(A -15 )/ (B+ 15 )= 2 / 3

3 A- 45 =2B-30

3A - 2B = 75..... (2)

By solving both equation

B=30

So Batty is 30 years old

.
All the six members A,B,C,D,Eand F of the family are travelling together.B is the son of C but C is not the mother of B. A and C are married couple . E is the brother of C. D is daughter of A .F is the brother of B . Which of the following is a pair of females.

B is the son of C is not the mother of B means C is the father of B. A is married to C means A is the mother of B . F is the brother of B means F is son of A and C .D is daughter of A means D is daughter of A means D is daughter A and C. Clearly, the females are mother A and daughter D..

Magi bought seven boxes. A week later half of all her boxes were destroyed in a fire. There are now only 22 boxes left. With how many did she start?

Let's Marla have "x" boxes.

She bought 7 more: x+7

Half of them destroyed: x+7/2

Left with:

x+7/2=22

x+7=22 x 2

x+7=44

x=37

She started with 37 boxes

.
In following question, a number series is given with one term missing. Choose correct alternative

4, 8, 28, 80, 244, x

4, 8, 28, 80, 244, x

The patter is alternate 3

So following above formula we get:

3

3

3

3

3

So last no 3

A family consists of 6 members P, Q, R, S, T, and U . There are two married couples . Q is a doctor and the father of T ,U is grandfather of R and is a contractor . s is grandmother of T and is a housewife. There is one doctor, one contractor -one house wife and two students in the family.

Which of the following is definitely a group of male members?

Q the doctor, is the father of T. S, the house wife, is the grandmother of T and hence the mother of Q. Since there are only two married couples one being that of Q, the grandfather of R i. e, U must be married to S. Thus, R and T will be both children of Q and these must be the student. So P, who remains, Shell be the wife of Q and she alone can be the nurse. Thus, U must be the contractor. Clearly, for definite the males are Q, the father and U, the grandfather..