Answer: is C 40%
Step-by-step explanation:
The answer is C, forty percent.
To find Molly’s average reading rate with the TV on as a percent of her average reading rate with the TV off, let’s create a table to keep track of the information.
With the TV on, Molly read twenty pages in two hours, so let’s find the average number of pages she read per hour, which we’ll call r.
We can write a proportion to solve for r: Twenty is to two as r is to one.
Simplifying, we get two r equals twenty, so r equals ten.
Next we find Molly’s hourly reading rate with the TV off.
The problem states that with the TV off, Molly read twenty-five pages in one hour.
Now, to express the first rate as a percent of the second rate, we can write this proportion: Ten is to twenty-five as p is to one hundred.
To simplify, we can multiply both sides by one hundred to get “one thousand over twenty-five” equals “p times one hundred over one hundred.”
Then, dividing out the factors of one hundred on the right results in one thousand over twenty-five equals p, or p equals forty.
So, Molly’s average reading rate with the TV on is forty percent of her average reading rate with the TV off.
To check our answer, we can multiply twenty-five by forty percent, which does equal ten.
