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attashe74
5 days ago
12

) If the pattern shown continues, how many black keys appear on a portable keyboard with 49 white keys? Suggestion: use equivale

nt ratios or a rate table to confirm your answer.

Mathematics
2 answers:
babunello [8.4K]5 days ago
7 0
In the pattern, there are 5 black keys along with 7 white keys. With 49 white keys present, we can express this as 49 = 7×7. Thus, the number of black keys becomes 7×5, leading to a total of 35 black keys.
Zina [9.1K]5 days ago
5 0
There are 5 black keys for each 7 white keys. Hence, the ratio stands at 5:7. To determine how many black keys correspond to 49 white keys, we calculate the scaling factor for the ratio: 49 divided by 7 equals 7. Thus, the original ratio is scaled by 7. Therefore, the total number of black keys equals 5 multiplied by this scaling factor, resulting in 35 black keys.
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The percent enlargement required is 125%

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Since the photocopy machine reduces sizes to 80% of the original

Therefore:

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0.80*100%=80%

Copy N 2

0.80*80%=64%

Copy N 3

0.80*64%=51.2%

Copy N 4

0.80*51.2%=40.96%

Copy N 5

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Copy N 6

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Copy N 7

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Copy N 8

0.80*20.97%=16.78%

Copy N 9

0.80*16.78%=13.42%-------------> 13.42% < 15%

Therefore,

The answer to Part b) is

The necessary number of copies to achieve this is 9


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Answer:

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