935 books were in the school library. 385 books were checked out in the morning. Then, 412 more books were checked out in the afternoon. After checking some at night 20 books were left. How many books were checked out at night?

148

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128

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138

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118

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Solution

The correct option is D 118
Say:
$∙$ Read the question.
Steps:
$∙$ How many total books were there in the school library?
Ans: 935

$∙$ How many books were checked out in the morning?
Ans: 385

$∙$ Which operation will be used here?
Ans: Subtraction

$∙$ How many books are remaining in the library now?
Ans: 935 - 385 = 550 (WB)

$∙$ How many books were checked out in the afternoon?
Ans: 412

$∙$ Which operation will be used here?
Ans: Subtraction

$∙$ How many books are remaining in the library now?
Ans: 550 - 412 = 138 (WB)

$∙$ How many books were left after checking some at night?
Ans: 20

$∙$ Which operation will be used here?
Ans: Subtraction

$∙$ How many books were checked at night?
Ans: 138 - 20 = 118 (WB)

WB:

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