Aptitude - Alligation or Mixture - Discussion

Actually, the alligation formula.

Cheaper price dearer price.
Mean price.

From this formula, 720 itself come first. So the answer is 3:2.

Thank you all for the explanation.

Thank you, your explanation was helpful.

Hello, According to alligation rule the answer is wrong. But I referred some books, I came to know that when in the question we gave the same kind of products like (first kind of rice and second of rice as given in the above question).
We should take the allegation rule as per question sequence.

In the above question, we have the highest value 7.20 first followed by 5.70. So we should take 7.20 first in alligation rule.

Hope my answer is helpful.

No, this answer is wrong because it contains cheaper quantity on the left side and higher quantity on other side but in this solution, it is appearing on opposite side according to the rule of alligation.

Its kind of star problem conducted by some corporate company to check that canditate's are guessing.

Details solution:

Let, X kg mixture with take 7.20 and 1 kg mixture with take 5.70.

Then, Cost price of 1 kg mixture is (7.20x + 5.70)/(x+1).

According to the question:

(7.20x + 5.70)/(x+1) = 6.30.

=> 7.20x + 5.70 = 6.30x + 6.30.

=> 0.90x = 0.60.

=> x = 2/3.

As per alligation rule they have written in wrong order.

7.20(x)+5.70(y)/x+y = 6.30.

Here x and y are the ratio's in which they are mixed.

7.20(x)+5.70(y) = 6.30(x)+6.30(y).

On solving we get x:y = 2:3.

This is the easiest method for these kind of problems.

Guys following rule of alligation we will get 3:2 (Cheaper quantity:Dearer quantity) as answer but in question it is asked the ratio of dearer qty to the cheaper one tats why answer will be 2:3 hope I have made my point clear!

Rule of alligation we will get 3:2 (Cheaper quantity: Dearer quantity) as answer but in question it asked the ratio of dearer qty to the cheaper one tats why answer will be 2:3 hope I have made my point clear!