Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 9)
9.
A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?
Answer: Option
Explanation:
| Total quantity of petrol consumed in 3 years |
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Total amount spent = Rs. (3 x 4000) = Rs. 12000.
 Average cost = Rs. |
 |
12000 x 51 |  |
= Rs. | 6120 | = Rs. 7.98 |
| 76700 | 767 |
Discussion:
93 comments Page 3 of 10.
Venkat said:
10 years ago
Please solve this equation 4000(2/15 + 1/8 + 2/17) = ?
(1)
Mansingh budha said:
5 years ago
I do not understand this problem. How can I solve it? please solve it again.
(1)
Ganapathy said:
1 decade ago
What about this.
1yr 7. 50 * 4000 = 30000.
2yr 8. 00 * 4000 = 32000.
3yr 8. 50 * 4000 = 34000.
Total = 96000.
Total amount spend for 3yrs = 4000*3 = 12000.
Avg amt spent for 3 years = 96000/12000 = 8Rs.
1yr 7. 50 * 4000 = 30000.
2yr 8. 00 * 4000 = 32000.
3yr 8. 50 * 4000 = 34000.
Total = 96000.
Total amount spend for 3yrs = 4000*3 = 12000.
Avg amt spent for 3 years = 96000/12000 = 8Rs.
(1)
Rajeshwar Singh said:
9 years ago
Hi, everyone the best way to solve the equation is we having value 7.50, 8, 8.50.
For those value whose in the decimal format we wl divide by as per req we wl divide 7.50/100 and there is no need for 8 wl do for 8.50/100 nw we calculate like that 4000(1/7.5+1/8+1/8.5).
4000(100/7.5+1/8+100/8.5).
This will get the value.
For those value whose in the decimal format we wl divide by as per req we wl divide 7.50/100 and there is no need for 8 wl do for 8.50/100 nw we calculate like that 4000(1/7.5+1/8+1/8.5).
4000(100/7.5+1/8+100/8.5).
This will get the value.
Subai said:
8 years ago
Thanks, really useful.
Sharja said:
8 years ago
Yes, right @Mass.
Lavina said:
8 years ago
Nice one, it's really helpful, thanks @M. V. Krishna.
Aman said:
8 years ago
1st-year cost of petrol=7.50.
2nd-year cost of petrol=8.
3rd-year cost of petrol=8.50.
The spend amounts each year=4000.
1st-year the quantity of petrol used =4000/7.50=533.33,
2nd yr = 4000/8=500,
3rd yr=4000/8.50=503.33,
total amount spend = 4000 * 3/quantity of petrol use.
12000/1536.66 = 7.9.
2nd-year cost of petrol=8.
3rd-year cost of petrol=8.50.
The spend amounts each year=4000.
1st-year the quantity of petrol used =4000/7.50=533.33,
2nd yr = 4000/8=500,
3rd yr=4000/8.50=503.33,
total amount spend = 4000 * 3/quantity of petrol use.
12000/1536.66 = 7.9.
Mass said:
8 years ago
Here, the Question should be what is the average cost he spent per litre of petrol if he spends 4000 each year? Not the average cost of petrol?
Mahadeb said:
9 years ago
Thanks for the explanation.
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