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trapecia [35]
3 years ago
13

Half of your baseball card collection got wet and was ruined. You bought 9 cards to replace some that were lost. How many did yo

u begin with if you now have 20?
Mathematics
1 answer:
PtichkaEL [24]3 years ago
6 0

solution:

n/2 + 9 = 20

n/2=20-9

n/2=11

n=22

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Answer:

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Step-by-step explanation:

Given equation: \[\frac{1}{n-4}-\frac{2}{n}=\frac{3}{4-n}\]

Simplifying the Left Hand Side of the equation by taking the LCM of the denominator terms:

\[\frac{n}{n*(n-4)}-\frac{2*(n-4)}{n*(n-4)}=\frac{3}{4-n}\]

=> \[\frac{n - 2*(n-4)}{n*(n-4)}=\frac{3}{4-n}\]

=> \[\frac{n - 2n + 8}{n*(n-4)}=\frac{3}{4-n}\]

=> \[\frac{8 - n}{n*(n-4)}=\frac{3}{4-n}\]

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=> \[2n =8\]

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