80 books to 64 books percent of change

Mathematics

2 answers:

Alecsey [184]3 years ago

5 0

Answer:

-20%

Step-by-step explanation:

64 to 80⬇

((64 - 80 / 64)) × 100 = 25 %

Therefore, your answer would have to be: 25% since it increased

Or you can try going with this method as well

80 to 64 ⬇

((80 - 64 / 80 )) × 100 = -20%

Therefore, for that method your answer would be-20% because it decreased

VladimirAG [237]3 years ago

5 0

Answer:

25% increase

Step-by-step explanation:

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Answer:

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7.60. When Paul crossed the finish line of a 60-meter race, he was ahead of Robert by 10 meters and ahead of Sam by 20 meters. S

Lelechka [254]

Answer:

The number of meters Robert will beat Sam is 12 meters.

Step-by-step explanation:

Given:

When Paul crossed the finish line of a 60-meter race, he was ahead of Robert by 10 meters and ahead of Sam by 20 meters. Suppose Robert and Sam continue to race to the finish line without changing their rates of speed.

Find:

the number of meters by which Robert will beat Sam

Step 1 of 1

When Paul finishes, Robert has run 60-10=50 meters and Sam has run 60-20=40 meters.

Therefore, when Robert and Sam run for the same amount of time, Sam covers $\frac{40}{50}=\frac{4}{5}$ of the distance that Robert covers. So, while Robert runs the final 10 meters of the race, Sam runs $\frac{4}{5} \cdot 10=8$ meters.