Aptitude - Alligation or Mixture - Discussion
Discussion Forum : Alligation or Mixture - General Questions (Q.No. 11)
11.
Find the ratio in which rice at Rs. 7.20 a kg be mixed with rice at Rs. 5.70 a kg to produce a mixture worth Rs. 6.30 a kg.
Answer: Option
Explanation:
By the rule of alligation:
| Cost of 1 kg of 1st kind Cost of 1 kg of 2nd kind | ||
| 720 p | Mean Price 630 p | 570 p |
| 60 | 90 | |
Required ratio = 60 : 90 = 2 : 3.
Discussion:
30 comments Page 2 of 3.
Oldman said:
1 decade ago
Let the ratio be x/1-x
Then
7.20 (1-x) + 5.70 x = 6.30
7.20 -7.20x + 5.70x =6.30
7.20-1.50x =6.30
7.20-6.30 /1.50 =x
0.90/1.50 = x
3/5 =x
1-x = 1-3/5 =2/5
x/1-x = 3/5 /2/5 = 3/2
Then
7.20 (1-x) + 5.70 x = 6.30
7.20 -7.20x + 5.70x =6.30
7.20-1.50x =6.30
7.20-6.30 /1.50 =x
0.90/1.50 = x
3/5 =x
1-x = 1-3/5 =2/5
x/1-x = 3/5 /2/5 = 3/2
Siva said:
9 years ago
Actually, the alligation formula.
Cheaper price dearer price.
Mean price.
From this formula, 720 itself come first. So the answer is 3:2.
Cheaper price dearer price.
Mean price.
From this formula, 720 itself come first. So the answer is 3:2.
Angeeta said:
1 decade ago
According to the formula the cheaper price is came frist and bearer price is second. so according to me the answer is 90:60=3:2
am i right?
am i right?
Sakshi said:
1 decade ago
According to books cheaper price shoul b taken firtt then dearer. So I think answer is 3:2. Please clear my doubt m I right?
Nitin gusain said:
1 decade ago
Yes @Angeeta according me you are right.
I think it is a mistake.
It should be 90:60 or 3:2.
I think it is a mistake.
It should be 90:60 or 3:2.
(1)
Vasumaila said:
1 decade ago
worth of cost=6.30
so 6.30*100=630
den
720-630=90
630-570=60
so
90:30=2:3
so 6.30*100=630
den
720-630=90
630-570=60
so
90:30=2:3
(1)
ManuAdhish said:
8 years ago
Use weighted average= 7.2x+5.7y/x+y=6.3,
On solving we get x/y=2/3.
On solving we get x/y=2/3.
(2)
Shruti said:
8 years ago
No cheaper quantity is mixed in more amount so answer is 2 : 3.
Chirag said:
1 decade ago
@Ajay
630 - 570 = 60 and
720 - 630 = 90
It is simple.
630 - 570 = 60 and
720 - 630 = 90
It is simple.
Jas said:
10 years ago
As per alligation rule they have written in wrong order.
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