Reagan is reading a mystery novel. she has 3 chapters left to read, and each chapter contains 12 pages. the book has 342 pages in all. which of the following gives the number of pages reagan has already read?

342 − (3 × 12)

342 + (-12) + (-12) + (-12)

306

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Explanation :

The number of chapters left is 3, and each chapter has 12 pages. So, the number of pages left to read is (3 × 12).

The book has 342 pages in all. The number of pages Reagan has read is the difference of 342 and (3 × 12):

342 − (3 × 12) = 342 − 36 = 306.

The expression 342 + (-12) + (-12) + (-12) is also equivalent to 306.