Select the correct answer. joshua likes to read. he read 6 books when he was 6 years old. every year he doubled the number of books he read the previous year. how many total books did he read between the ages of 6 and 10? a. 60 b. 90 c.186 d.187

C.186

Step-by-step explanation:

1. You know that he read 6 books when he was 6 years old and every year he doubled the number of books he read the previous year.

2. Let's call the number of book he read each year and the number of books he read between the ages of 6 and 10, then:

 - At 6 years old:

- At 7 years old:

- At 8 years old:

- At 9 years old:

- At 10 years old:

The total books he read between the ages of 6 and 10 is:

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

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