Frank works in the supply room of a law firm. At the beginning of the month, he had 21 boxes of pens with 13 pens in each box. At the end of the month, there were 45 pens left. How many pens did he give out over the month?
A.
273
B.
79
C.
228
D.
318

At the beginning of the month, Frank had 21 boxes of pens with 13 pens in each box. This means that the total number pens that he Frank had at the beginning of the month is 13 × 21 = 273 pens.

At the end of the month, there were 45 pens left. The number of pens that he gave out will be the number of pens at the beginning of the month - the number of pens left at the end of the month. It becomes

273 - 45 = 228

Frank works in the supply room of a law firm. At the beginning of the month, he had 21 boxes of pens with 13 pens in each box. At the end of the month, there were 45 pens left. How many pens did he give out over the month? A. 273 B. 79 C. 228 D. 318

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Frank works in the supply room of a law firm. At the beginning of the month, he had 21 boxes of pens with 13 pens in each box. At the end of the month, there were 45 pens left. How many pens did he give out over the month?
A.
273
B.
79
C.
228
D.
318