A diner has 645 napkins. 325 napkins are used at lunch. 113 napkins are used at dinner.
Melanie says that 325−113=n napkins are used in all, and that 645−212=r napkins are left.
Is her answer reasonable? Explain why or why not.
Part A
Is her answer reasonable?
(1 point)
Responses
No, because at least 325 napkins are used. So, 212 is too small a number for n.
No, because at least 325 napkins are used. So, 212 is too small a number for n .
No, because she adds the number of total napkins used to find n.
No, because she adds the number of total napkins used to find n .
No, because she makes an error in her subtraction.
No, because she makes an error in her subtraction.
Yes, her answer is reasonable.
Yes, her answer is reasonable.
Question 2
Part B
Choose the equations you could use to find the number of napkins that remain after lunch and dinner. t represents the napkins that remain after lunch and dinner.
(1 point)
Responses
325−113=t
325 - 113 = t
645−438=t
645 - 438 = t
645−325=t
645 - 325 = t
645−212=t
645 - 212 = t
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Part A:
No, her answer is not reasonable. The number of napkins used in all should be 325 + 113 = 438, so the number of napkins left should be 645 - 438 = 207, not 212.
Part B:
The equations that could be used to find the number of napkins that remain after lunch and dinner are:
1) 325 - 113 = t
2) 645 - 438 = t
3) 645 - 325 = t