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John bought grocery products for 10 dollars using 55 coins. If John us
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10 Sep 2019, 23:17
10 Sep 2019, 23:17
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Difficulty:
25%
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Question Stats:
84% (02:06) correct
16%
(02:21)
wrong
based on 19
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John bought grocery products for 10 dollars using 55 coins. If John used quarters and dimes, what is the difference between the numbers of dimes to the number of quarters that he used? (quarter = 25 cents, dime = 10 cents)
A. 5.
B. 10.
C. 15.
D. 25.
E. 30.
A. 5.
B. 10.
C. 15.
D. 25.
E. 30.
Intern
Joined: 05 Oct 2013
Posts: 9
Given Kudos: 5
GMAT 1: 610 Q45 V29
Re: John bought grocery products for 10 dollars using 55 coins. If John us
[#permalink]
10 Sep 2019, 23:33
10 Sep 2019, 23:33
Is the answer to the above question A) 5?
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Posted from my mobile device
Re: John bought grocery products for 10 dollars using 55 coins. If John us
[#permalink]
10 Sep 2019, 23:35
10 Sep 2019, 23:35
1
Kudos
Assuming John has used q quarters and (55-q) dimes:
25*q+10(55-q)=10*100 (1Dollar=100 cents)
solving the eq for q: 15q=450 => q=30, so dimes used=55-q=25
so difference between quarters and dimes used = 30-25 = 5 (A)
25*q+10(55-q)=10*100 (1Dollar=100 cents)
solving the eq for q: 15q=450 => q=30, so dimes used=55-q=25
so difference between quarters and dimes used = 30-25 = 5 (A)
