either dimes or nickels

Expert replies

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Sat Oct 15, 2011 2:38 am

A purse contains a total of 15 coins,all of which are either dimes or nickels. If the value of the collection is $1.20, how many are dimes and how many are nickels?
(A) 10 dimes and 5 nickels
(B) 7 dimes and 8 nickels
(C) 11 dimes and 4 nickels
(D) 9 dimes and 6 nickels
(E) 8 dimes and 7 nickels

The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

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Source: Beat The GMAT — Problem Solving | Sat Oct 15, 2011 2:38 am

sl750: Master | Next Rank: 500 Posts; Posts: 496; Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member; Thanked: 38 times

by sl750 » Sat Oct 15, 2011 2:48 am

I think this question should also tell us the value of a dime and a nickel, otherwise this question is biased

D+N = 15 ------ 1
10D+5N = 120 ----- 2

Multiply equation 1 by 5

Subtract equation 1 from 2
5D = 45; D=9; N=6

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Sat Oct 15, 2011 3:40 am

sl750 wrote:I think this question should also tell us the value of a dime and a nickel, otherwise this question is biased

D+N = 15 ------ 1
10D+5N = 120 ----- 2

Multiply equation 1 by 5

Subtract equation 1 from 2
5D = 45; D=9; N=6

The knowledge of US currency coins and their inter conversion is a must on GMAT. They would never provide us with this additional information whenever they would mention terms like penny, nickel, dime, quarter, dollar, or half dollar in their questions. So this question is not biased and yours is the right answer too. Please also mention your answer choices as A-E in the beginning or in the end.

https://www.immihelp.com/newcomer/usa-cu ... coins.html

The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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