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Harlamova29_29 [7]
3 years ago
8

A store sells 8 cans of nuts for $20 how much would it cost to buy 7 cans of nuts?

Mathematics
2 answers:
pshichka [43]3 years ago
8 0
To get your answer you divide $20 by 8 to get $2.50 then you multiply it by 7 to get $17.50. Hope I helped
liubo4ka [24]3 years ago
5 0
The answer to this question is 17.5. Because i divided 20 by 8 and got 2.5 and times it by 7.
17.5
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The set of the consecutive odd numbers 1, 3, 5, 7, ... , N has a sum of 400. How many numbers are in the set?
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Well, we could try adding up odd numbers, and look to see when we reach 400. But I'm hoping to find an easier way.

First of all ... I'm not sure this will help, but let's stop and notice it anyway ...
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Now, let's put down an even number of odd numbers to work with,and see
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         1, 3, 5, 7, 9, 11, 13, 15 .

Number of items in the set . . . 8
Sum of all the items in the set . . . 64

Hmmm.  That's interesting.  64 happens to be the square of 8 . 
Do you think that might be all there is to it ?

Let's check it out:

Even-numbered lists of odd numbers:

1, 3                                   Items = 2, Sum = 4
1, 3, 5, 7                           Items = 4, Sum = 16
1, 3, 5, 7, 9, 11                 Items = 6, Sum = 36
1, 3, 5, 7, 9, 11, 13, 15 . . Items = 8, Sum = 64 .

Amazing !  The sum is always the square of the number of items in the set !

For a sum of 400 ... which just happens to be the square of 20,
we just need the <em><u>first 20 consecutive odd numbers</u></em>.

I slogged through it on my calculator, and it's true.

I never knew this before.  It seems to be something valuable
to keep in my tool-box (and cherish always).


3 0
3 years ago
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