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postnew [5]
3 years ago
7

The number of library books increased by 20% after it bought new books in May. The number increased by another 20% after someone

donated 300 more books in June. Find the number of books in the library before it bought new books in May.
Please help I'm confused!!
Mathematics
1 answer:
anygoal [31]3 years ago
4 0

Answer:

               

Step-by-step explanation:

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This is a proportion question. We can express this as an equation where the answer is x:

\frac{1}{250} = \frac{x}{378}

From there, you can just cross-multiply and divide to get:

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A tenth of 250 is 25, so this is roughly \frac{375}{250} or \frac{17}{10}, so it'll be approximately 1.7 inches on the map.
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The maximum land speed of a cheetah is about 120km/hour.
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_____

<em>Additional comment</em>

In general, units conversion is done by multiplying by a factor whose numerator and denominator have equal values, but different units. The units in that fraction need to be arranged to cancel the units you don't want and leave the units you do want.

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