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cadenm81
13.08.2020 •
Mathematics
what is the largest amount of postage in cents that cannot be made by using only 3 cent and 5 cent stamps?
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Ответ:
The largest you can't make is 7 cents.
Step-by-step explanation:
Once you get 3 consecutive amounts, you can get all larger ones just by adding 3 cent stamps. So let's see what you can make:
1 no
2 no
3 yes
4 no
5 yes
6 yes
7 no
8 yes, and this will give you 11 14 17 etc
9 yes, and this will give you 12 15 18 etc
10 yes, and this will give you 13 16 19 etc.
Ответ:
y=4
Step-by-step explanation:
4y + 3 =19
4y = 16
y= 4