Aptitude - Decimal Fraction - Discussion

First cross multiply each term with adjacent next term. So we get a number series as follows.

Eg. take option D.

6*6 = 36
7*5 = 35
5*5 = 25
6*4 = 24
4*7 = 28
5*3 = 15
2*3 = 6
1*5 = 5

From this series we clear that it is in descending order.

These type of problems can be solved by Cross Multiplication principle.

I will try to explain with the present problem scenario

Consider (1/3) and (2/5)

STEP 1: Multiply numerator of 1st with denominator of 2nd
Multiply denominator of 1st with numerator of 2nd

STEP 2: The result is (1*5) and (3*2)
i.e.., 5 and 6
Now Check which number is greater of the two.
In this case 6>5
STEP 3: Check which fraction's numerator is part of the product
that results in greater number(6)

In this case 6 has numerator of 2nd fraction (2/5)
So we can say that (2/5) >(1/3)

SO ON WITH THE NEXT FRACTIONS ALSO

Thanks @Deepak.

6/7*5/6 cross multiplication.

36, 35 (6/7 = 36, 5/6 = 35).

6/7 > 5/6.

I did it by seeing just observe any numbers with same denominators like I supposed 7 denominator for option A I saw that 3/7 is coming before then 6/7 so option A is not in descending order, like as I tried B & C, lastly I got D which is correct for my consideration.

Easy trick for solving this type of question 1st take difference of numerator and denominator and arrange them according to there acceding and descending order and respective fraction is answer of question if deference is common between 2 fraction then select greater base between them is higher value fraction.

@Umesh.

Your trick is not applicable for all types of questions.

It will work only when difference between the given numerator is equal.

Please tell me about it shortly.

It is very easy. Among all option check out the last and first number you will get answer.

Check this technique:

In starting it may be consume some time but after practice we will solve in second.

6/7, 5/6, 4/5, 3/7, , 2/5, 1/7.

Check difference between numerator and denominator and then divide numerator with difference.

6-7 = 1.
6/1 = 6.

5-6 = 1.
5/1 = 5.

Don't confuse with numerator greater or smaller.

4-5 = 1.
4/1 = 4.

3-7 = 4.
3/4 = 0.7.

2-5 = 3.
2/3 = 0.6.

1-7 = 6.
1/6 = 0.1.