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If 25 percent of the surface area of right circular cylinder X is shad

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If 25 percent of the surface area of right circular cylinder X is shad [#permalink]

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New post 14 Mar 2018, 02:12
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If 25 percent of the surface area of right circular cylinder X is shaded and 40 percent of the surface area of right circular cylinder Y is shaded, what is the area of the shaded portion of right circular cylinder X?

(1) The area of the shaded portion of the surface area of cylinder X is 75 percent of the area of the shaded portion of the surface area of cylinder Y
(2) The surface area of cylinder Y is 10
[Reveal] Spoiler: OA

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Re: If 25 percent of the surface area of right circular cylinder X is shad [#permalink]

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New post 14 Mar 2018, 02:14
Bunuel wrote:
If 25 percent of the surface area of right circular cylinder X is shaded and 40 percent of the surface area of right circular cylinder Y is shaded, what is the of the shaded portion of right circular cylinder X?

(1) The area of the shaded portion of the surface area of cylinder X is 75 percent of the area of the shaded portion of the surface area of cylinder Y
(2) The surface area of cylinder Y is 10


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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

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Re: If 25 percent of the surface area of right circular cylinder X is shad [#permalink]

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New post 14 Mar 2018, 02:19
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Bunuel wrote:
If 25 percent of the surface area of right circular cylinder X is shaded and 40 percent of the surface area of right circular cylinder Y is shaded, what is the of the shaded portion of right circular cylinder X?

(1) The area of the shaded portion of the surface area of cylinder X is 75 percent of the area of the shaded portion of the surface area of cylinder Y
(2) The surface area of cylinder Y is 10


Let A1 be surface area of right circular cylinder X and A2 be that of other cylinder.

Statement 1) A1 * 0.25 = 0.75 * .40 * A2

SO we get a relationship between A1 and A2.

Not suff.

Statement 2) A2 = 10.

Not suff.

1+2 together. sufficient as we can back-calculate the req information.

Hence C.

Kudos! if you liked the explanation....
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Re: If 25 percent of the surface area of right circular cylinder X is shad [#permalink]

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New post 14 Mar 2018, 06:08
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KUDOS
Bunuel wrote:
If 25 percent of the surface area of right circular cylinder X is shaded and 40 percent of the surface area of right circular cylinder Y is shaded, what is the of the shaded portion of right circular cylinder X?

(1) The area of the shaded portion of the surface area of cylinder X is 75 percent of the area of the shaded portion of the surface area of cylinder Y
(2) The surface area of cylinder Y is 10


Therese seems to be a word missing
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Re: If 25 percent of the surface area of right circular cylinder X is shad [#permalink]

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New post 14 Mar 2018, 06:12
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Expert's post
Aramsamsam wrote:
Bunuel wrote:
If 25 percent of the surface area of right circular cylinder X is shaded and 40 percent of the surface area of right circular cylinder Y is shaded, what is the of the shaded portion of right circular cylinder X?

(1) The area of the shaded portion of the surface area of cylinder X is 75 percent of the area of the shaded portion of the surface area of cylinder Y
(2) The surface area of cylinder Y is 10


Therese seems to be a word missing


The word "area" was missing. Edited. Thank you.
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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.


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Re: If 25 percent of the surface area of right circular cylinder X is shad   [#permalink] 14 Mar 2018, 06:12
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If 25 percent of the surface area of right circular cylinder X is shad

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