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Shalnov [3]
3 years ago
15

At noon, a tank contained 6 cm of water. After several hours, it contained 3 cm of water. What is the percent decrease of water

in the tank?
The percent decrease of water in the tank is [%.
Mathematics
2 answers:
tangare [24]3 years ago
5 0

Answer:

50

Step-by-step explanation:

masya89 [10]3 years ago
4 0

Answer:

50%

Step-by-step explanation:

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Answer:

<em>19800 seconds, or 330 minutes, or 5 hours + 30 minutes</em>

Step-by-step explanation:

<u>Number Permutations</u>

We know the phone number has 7 digits, 4 of which are known by Mark. This leaves him 3 digits to guess with. We also know the last one is not zero. The number can be represented as

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Where X can be any digit from 0 to 9 and Y can be any digit from 1 to 9. The first two can be combined in 10x10 ways, and the last one can be of 9 ways, this gives us 10x10x9 = 900 possible permutations.

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