Question

Soham read 60 books last year. The average number of books he read over the first 10 months of the last year was four books per month. If he read 11 books in November, how many books did he read in December?

(a) 4
(b) 5
(c) 6
(d) 7

Answer 1

Soham read 9 books in December after reading an average of 4 books per month for the first 10 months and 11 books in November.

Step-by-step explanation:

Soham read a total of 60 books in the last year. For the first 10 months, he read at an average of 4 books per month, which totals to 40 books (10 months × 4 books/month). In November, he read 11 books. To find out how many books he read in December, we subtract the number of books read in the first 10 months and in November from the total number of books read in the year:

60 books (total) - 40 books (Jan-Oct) - 11 books (November) = 9 books.
To find the number of books Soham read in December, we need to subtract the total number of books he read in the first 10 months (40 books) and November (11 books) from the total number of books he read last year (60 books). Subtracting 51 from 60, we find that Soham read 9 books in December.