Aptitude - Problems on Numbers - Discussion

Discussion Forum : Problems on Numbers - General Questions (Q.No. 2)
2.
Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is:
9
11
13
15
Answer: Option
Explanation:

Let the three integers be x, x + 2 and x + 4.

Then, 3x = 2(x + 4) + 3      x = 11.

Third integer = x + 4 = 15.

Video Explanation: https://youtu.be/_77C9YE321Y

Discussion:
75 comments Page 1 of 8.

Mahendrakumar said:   4 weeks ago
The first three odd numbers,

X, X+2, X+4.

in the question they've mentioned 3 times the 1st odd number(which is X)

So, 3X.
Then they've mentioned 3 more than twice of the third number 3+2(X+4).
then;

3x = 3+ 2(x + 4).
3x = 3+ 2x + 8.
3x - 2x = 3 + 8.
x = 11.

So, the ans is 11 +4 => 15.
(1)

Megersa Tadale said:   2 years ago
Suppose we take x,x+2,x+4 for odd consecutive numbers;

Then, according to the question, the first among the consecutive number is 3 more than twice the third number.

It means 3x+3=2(x+4) then;
we will get 3x+3=2x+8(now collecting like terms);
then 3x-2x=8-3.

x=5
So the third number is x+4----->>>> 9.
(3)

Tashi Tshering said:   3 years ago
Here,
1,3,5 three odd consecutive no;
Three times the first of three consecutive odd integers is 3 more than twice the third,
3x when the third inter is x=5.
3*5=15.
(5)

Aryan said:   3 years ago
Here

Three odd consecutive number.
3, 5, 7 = 3 + 5 + 7 then ans 15.
(22)

Pinky said:   3 years ago
My answer is 15.

Let 2n+1 be an odd number for any value of n from 0 up to infinity.

Take a look: If n=0, 2n+1 is 1. If n=1, 2n+1 is 3. See, the resulting number is always odd whether n is odd or even.

Let (2n+1), (2n+3), (2n+5) be the three consecutive numbers.
Just to see if these three are really consecutive odd, let us try to substitute n=0. If n=0, the resulting three consecutive odd are 1,2,3. If n=1, the resulting three consecutive odd are 3,5,7. This is just to show you that these three will really result to three consecutive odd for any value of n from 0 up to infinity.

Since we do not know exactly what are these three consecutive odd, so let us take these (2n+1), (2n+3), (2n+5) as the three consecutive odd numbers.

Solution:
3(2n+1) = 2(2n+5)+3
6n+3 = 4n+10+3
6n-4n = 10+3-3
2n = 10
n = 5.
Since the third odd number is represented by 2n+5, just substitute 5 to n. So the third odd number is 15.

We can also say that the three consecutive odds are 11, 13, 15. The third is 15.
(1)

Lavanya said:   4 years ago
Let three consecutive odd integers are: x, x+2,x+4.

Three times the first of three integers, so--> 3x; is 3 more than twice the third so--> 3+ 2(x+4).

Then, we get an equation like 3x=3+2(x+4).
=3+2x+8.
3x-2x=11
X=11.

So, the third integer is x+4=15.
(7)

Vamsikrishnareddy said:   5 years ago
Anybody can explain short cut of this problem.
(1)

Mahin said:   5 years ago
The Consecutive odd integers are (2x+1, 2x+3, 2x+5). Sub any no.for 'x', you'll get an odd integer.

Now, try solving the question with these three, you'll get X = 5;
That means the 3rd integer, 2X + 5 = 15.
(3)

Shanu kumar said:   5 years ago
Odd numbers are never be in form of x, x+2 etc.
Odd no Is in the form of 2x+1.
(3)

Pratap said:   5 years ago
X+1, X+3, X+5.
Atq:
3(X+1) = 3+2(X+5),
X = 10.
(2)


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