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Aleksandr [31]
3 years ago
5

How many numbers are between 200 and 400 that begin or end with 3 explain how you got it please

Mathematics
2 answers:
Nikitich [7]3 years ago
4 0
Alright, all numbers that are in the 300 start with a 3, that's 100 numbers

hold a sec, it said 'or' not 'and', so we have to exclude those that start and end with a 3, like 303 and 313. that is 10 of them

in every hundred, there are 10 numbers that end with a 3 (the ones like 3,13,23,33,43,53,63,73,83,93)

so from 200 to 300, there are 10 of those
from 300 to 400 there are 10, wait we said 'or' so nope

100-10+10
so 100 numbers
if you are allowed to include numbers that start and end with 3 (like 303), then there are 120 numbers
GuDViN [60]3 years ago
3 0
Removed. I made a mistake haha and someone made the correct one :)
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Explanation:

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9/90 = b/360

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<h3>b = 36</h3>

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A quick way to do this may be to notice how the jump from 9 to 90 is "times 10" so the jump from b to 360 is also "times 10". Think in reverse to divide 360 over 10 and we land on 36 as our answer. This line of thinking does not work as simple for all proportional problems.

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