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05 Sep 2021, 06:21
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Here's another way to look at the numbers in this problem- might help if you feel numbers are a bit inconvenient!
Not getting into the details of the problem, as it's already explained above!
We know that
138 = 0.82T ------- (1)
The other number involved in this problem is 124, which is 14 less than 138
Can you see any relation between 14 and 138? Or rather any relation between 13.8 (which is approximately 14) and 138?
So, you can say 10% of 138 is approx 14. Or, in other words, if you decrease 10% from 138, you get approx 124.
There you go!
Decreasing 10% from both sides of (1) we get: [Note that this is a legit operation - think of it as multiplying both sides by 0.9]
138 - 13.8 = 0.82T - 0.082T (same as 82% - 8%)
124 ~ 0.74T
We are interested in T - 0.74T = 0.26T
If 0.74T = 124, then 0.26T would anyways be greater than 40. (Think of 0.75 ad 0.25 for easy mental calculation!) Only one number in the given options comes close to the answer!
Hope this is clear!
Ambarish
Not getting into the details of the problem, as it's already explained above!
We know that
138 = 0.82T ------- (1)
The other number involved in this problem is 124, which is 14 less than 138
Can you see any relation between 14 and 138? Or rather any relation between 13.8 (which is approximately 14) and 138?
So, you can say 10% of 138 is approx 14. Or, in other words, if you decrease 10% from 138, you get approx 124.
There you go!
Decreasing 10% from both sides of (1) we get: [Note that this is a legit operation - think of it as multiplying both sides by 0.9]
138 - 13.8 = 0.82T - 0.082T (same as 82% - 8%)
124 ~ 0.74T
We are interested in T - 0.74T = 0.26T
If 0.74T = 124, then 0.26T would anyways be greater than 40. (Think of 0.75 ad 0.25 for easy mental calculation!) Only one number in the given options comes close to the answer!
Hope this is clear!
Ambarish
07 Sep 2021, 22:27
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Correct Option : E (44)
Before strom - water level - 124
After strom - water level - 138
Difference (138-124) = 14 -----------(1)
138 is 82% of tank capacity, then remaining 18% of tank capacity is 30 ------- (2)
Addition of 1 and 2 = 44
Before strom - water level - 124
After strom - water level - 138
Difference (138-124) = 14 -----------(1)
138 is 82% of tank capacity, then remaining 18% of tank capacity is 30 ------- (2)
Addition of 1 and 2 = 44
10 Oct 2025, 08:56
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I tried to solve this without too much calculation:
since 138B = 82%, we know that 18% is missing and so there should at least be around 20B water left (since 138 is greater than 100)
and 138-124 = 14, we know there much be more than 14 + 20 = 34B water of space. Since only choice E is greater, then it must be choice E
since 138B = 82%, we know that 18% is missing and so there should at least be around 20B water left (since 138 is greater than 100)
and 138-124 = 14, we know there much be more than 14 + 20 = 34B water of space. Since only choice E is greater, then it must be choice E
