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On a trip from the United States to Canada, Isabella took d U.S. dolla

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On a trip from the United States to Canada, Isabella took d U.S. dolla  [#permalink]

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New post 21 Mar 2019, 23:15
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E

Difficulty:

  35% (medium)

Question Stats:

65% (02:08) correct 35% (01:56) wrong based on 23 sessions

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On a trip from the United States to Canada, Isabella took d U.S. dollars. At the border she exchanged them all, receiving 10 Canadian dollars for every 7 U.S. dollars. After spending 60 Canadian dollars, she had d Canadian dollars left. What is the sum of the digits of d?

(A) 5
(B) 6
(C) 7
(D) 8
(E) 9

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Re: On a trip from the United States to Canada, Isabella took d U.S. dolla  [#permalink]

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New post 22 Mar 2019, 02:02
1
Bunuel wrote:
On a trip from the United States to Canada, Isabella took d U.S. dollars. At the border she exchanged them all, receiving 10 Canadian dollars for every 7 U.S. dollars. After spending 60 Canadian dollars, she had d Canadian dollars left. What is the sum of the digits of d?

(A) 5
(B) 6
(C) 7
(D) 8
(E) 9


10CAD=7$
1 CAD= $ 7/10
so money spent
d CAD = 7/10 * (d+60)
d= 140
sum = 5
IMO A
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Re: On a trip from the United States to Canada, Isabella took d U.S. dolla  [#permalink]

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New post 22 Mar 2019, 10:52
I don't understand your reasonening, could you explain further?

Does our answer not depend on the unknown d?
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Re: On a trip from the United States to Canada, Isabella took d U.S. dolla   [#permalink] 22 Mar 2019, 10:52
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On a trip from the United States to Canada, Isabella took d U.S. dolla

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