GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 23 Sep 2018, 19:00

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

16 ounces of birdseed mix contains 10% sesame seed by weight. How much

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 49320
16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 05 Jun 2018, 22:06
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

74% (00:57) correct 26% (00:47) wrong based on 106 sessions

HideShow timer Statistics

16 ounces of birdseed mix contains 10% sesame seed by weight. How much sesame seed must be added to produce a mix that is 20% sesame seed by weight?

(A) 1 ounce
(B) 1.6 ounces
(C) 2 ounces
(D) 2.4 ounces
(E) 4 ounces

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

e-GMAT Representative
User avatar
P
Joined: 04 Jan 2015
Posts: 2014
Re: 16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 05 Jun 2018, 22:18
1
1

Solution



Given:
    • 16 ounces of birdseed mix contains 10% sesame seed by weight

To find:
    • What amount of sesame seed must be added to produce a mix that is 20% sesame seed by weight

Approach and Working:
    • In the initial mix, amount of sesame seed = 16 * 0.1 = 1.6 ounces

Let us assume that the amount of sesame seed to be mixed is m ounces

Therefore, after mixing,
    • The amount of sesame seed = 1.6 + m
    • The total amount of mix = 16 + m

As the sesame seed accounts for 20% of the total mix amount, we can write
    • (16 + m) * 0.2 = 1.6 + m
    Or, 3.2 + 0.2m = 1.6 + m
    Or, 0.8m = 1.6
    Or, m = 2

Hence, the correct answer is option C.

Answer: C
_________________








Register for free sessions
Number Properties | Algebra |Quant Workshop

Success Stories
Guillermo's Success Story | Carrie's Success Story

Ace GMAT quant
Articles and Question to reach Q51 | Question of the week

Must Read Articles
Number Properties – Even Odd | LCM GCD | Statistics-1 | Statistics-2
Word Problems – Percentage 1 | Percentage 2 | Time and Work 1 | Time and Work 2 | Time, Speed and Distance 1 | Time, Speed and Distance 2
Advanced Topics- Permutation and Combination 1 | Permutation and Combination 2 | Permutation and Combination 3 | Probability
Geometry- Triangles 1 | Triangles 2 | Triangles 3 | Common Mistakes in Geometry
Algebra- Wavy line | Inequalities

Practice Questions
Number Properties 1 | Number Properties 2 | Algebra 1 | Geometry | Prime Numbers | Absolute value equations | Sets



| '4 out of Top 5' Instructors on gmatclub | 70 point improvement guarantee | www.e-gmat.com

Manager
Manager
avatar
S
Joined: 25 Jul 2017
Posts: 102
16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 05 Jun 2018, 22:31
16 ounces of birdseed mix contains 10% sesame seed by weight. How much sesame seed must be added to produce a mix that is 20% sesame seed by weight?

(A) 1 ounce
(B) 1.6 ounces
(C) 2 ounces
(D) 2.4 ounces
(E) 4 ounces

In 16 Ounces, we have 10% sesame seed i.e. 1.6 ounce.
now let assume x ounce of sesame seed needed to make mixture that contains 20% of sesame seed
=> (1.6+x)/(16+x)= 1/5
=> by cross-multiplication, 8+5x= 16+x
=> 4x=8
=> x=2
C is the answer.
Intern
Intern
avatar
B
Joined: 26 Feb 2018
Posts: 19
CAT Tests
16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 08 Jun 2018, 08:24
Bunuel wrote:
16 ounces of birdseed mix contains 10% sesame seed by weight. How much sesame seed must be added to produce a mix that is 20% sesame seed by weight?

(A) 1 ounce
(B) 1.6 ounces
(C) 2 ounces
(D) 2.4 ounces
(E) 4 ounces



\(\frac{1.6}{16}=.10\)
\(\frac{1.6+x}{16+x}=.20\)
\(1.6+x = 3.2+.2x\)
\(.8x=1.6\)
\(x=2\)

Ans = C
VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1088
Re: 16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 09 Jun 2018, 20:55
Bunuel wrote:
16 ounces of birdseed mix contains 10% sesame seed by weight. How much sesame seed must be added to produce a mix that is 20% sesame seed by weight?

(A) 1 ounce
(B) 1.6 ounces
(C) 2 ounces
(D) 2.4 ounces
(E) 4 ounces


let x=ounces of sesame seed to be added
1.6+x=.2(16+x)
x=2 ounces
C
Manager
Manager
User avatar
S
Joined: 31 Aug 2016
Posts: 107
Location: India
Concentration: Finance, General Management
GMAT 1: 680 Q49 V33
GPA: 2.81
Premium Member Reviews Badge CAT Tests
16 ounces of birdseed mix contains 10% sesame seed by weight. How much  [#permalink]

Show Tags

New post 23 Jun 2018, 07:32
Bunuel wrote:
16 ounces of birdseed mix contains 10% sesame seed by weight. How much sesame seed must be added to produce a mix that is 20% sesame seed by weight?

(A) 1 ounce
(B) 1.6 ounces
(C) 2 ounces
(D) 2.4 ounces
(E) 4 ounces



let x ounces of sesame seed is added to get 20% mix

so BM1(birdseed mix) contains = 10% sesame seed

BM2 contains = 100% sesame seed

therefore 16/x = (10 - 20)/(20-100)

16/x = 1/8

x = 16/8

x = 2 ounces

this method takes much less time
this method is explained in Removal/Replacement in Mixtures
_________________

Resources
GMATNinja Webinars
GMATNinja Chats

Quant
Mixtures

GMAT Club Bot
16 ounces of birdseed mix contains 10% sesame seed by weight. How much &nbs [#permalink] 23 Jun 2018, 07:32
Display posts from previous: Sort by

16 ounces of birdseed mix contains 10% sesame seed by weight. How much

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.