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Marty's Pizza Shop guarantees that their pizzas all have a [#permalink]

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27 Feb 2013, 04:14

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Marty's Pizza Shop guarantees that their pizzas all have at least 75% of the surface area covered with toppings, with a crust of uniform width surrounding them. If you order their best seller – a circular pizza with a diameter of 16 inches – what is the maximum width you can expect to see for the crust?

A. 0.8 inches B. 1.1 inches C. 1.6 inches D. 2.0 inches E. 2.5 inches

Marty's Pizza Shop guarantees that their pizzas all have at least 75% of the surface area covered with toppings, with a crust of uniform width surrounding them. If you order their best seller – a circular pizza with a diameter of 16 inches – what is the maximum width you can expect to see for the crust?

A. 0.8 inches B. 1.1 inches C. 1.6 inches D. 2.0 inches E. 2.5 inches

The area of 16 inches pizza is \(\pi{R^2}=8^2\pi=64\pi\).

The minimum area covered with toppings is \(\frac{3}{4}*64\pi=48\pi\) --> the radius of the toppings is \(\pi{r^2}=48\pi\) --> \(r=4\sqrt{3}\approx{6.9}\).

The maximum width for the crust possible = R - r = 8 - 6.9 = 1.1 inches.

Re: Marty's Pizza Shop guarantees that their pizzas all have a [#permalink]

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03 Mar 2013, 21:07

emmak wrote:

Marty's Pizza Shop guarantees that their pizzas all have at least 75% of the surface area covered with toppings, with a crust of uniform width surrounding them. If you order their best seller – a circular pizza with a diameter of 16 inches – what is the maximum width you can expect to see for the crust?

A. 0.8 inches B. 1.1 inches C. 1.6 inches D. 2.0 inches E. 2.5 inches

Total Area = 8 * 8 * pi Radius = 64 pi

Surface = .75 * 64 * pi = 48 pi Radius of surface = 4 sqrt (3) ~ 6.8

Re: Marty's Pizza Shop guarantees that their pizzas all have a [#permalink]

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23 Sep 2014, 05:38

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Marty's Pizza Shop guarantees that their pizzas all have a [#permalink]

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23 Sep 2014, 06:20

Bunuel wrote:

emmak wrote:

Marty's Pizza Shop guarantees that their pizzas all have at least 75% of the surface area covered with toppings, with a crust of uniform width surrounding them. If you order their best seller – a circular pizza with a diameter of 16 inches – what is the maximum width you can expect to see for the crust?

A. 0.8 inches B. 1.1 inches C. 1.6 inches D. 2.0 inches E. 2.5 inches

The area of 16 inches pizza is \(\pi{R^2}=8^2\pi=64\pi\).

The minimum area covered with toppings is \(\frac{3}{4}*64\pi=48\pi\) --> the radius of the toppings is \(\pi{r^2}=48\pi\) --> \(r=4\sqrt{3}\approx\) 6,9

The maximum width for the crust possible = R - r = 8 - 6.9 = 1.1 inches.

Answer: B.

\(r=4\sqrt{3}=6.9282....\).

The maximum width for the crust possible = R - r = 8 - 6.9282... = 1.0717.... inches. -----> 1,1 width would make the surface area covered with topping less than 75%

Answer: A

I know this might be picky, but shouldn't OA be A ? Does GMAT give these possible answers where rounding errors become very important Please fill me in case Im missing something (which I probably do)
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Last edited by TehMoUsE on 23 Sep 2014, 06:26, edited 1 time in total.

Marty's Pizza Shop guarantees that their pizzas all have at least 75% of the surface area covered with toppings, with a crust of uniform width surrounding them. If you order their best seller – a circular pizza with a diameter of 16 inches – what is the maximum width you can expect to see for the crust?

A. 0.8 inches B. 1.1 inches C. 1.6 inches D. 2.0 inches E. 2.5 inches

The area of 16 inches pizza is \(\pi{R^2}=8^2\pi=64\pi\).

The minimum area covered with toppings is \(\frac{3}{4}*64\pi=48\pi\) --> the radius of the toppings is \(\pi{r^2}=48\pi\) --> \(r=4\sqrt{3}\approx{6.9}\).

The maximum width for the crust possible = R - r = 8 - 6.9 = 1.1 inches.

Answer: B.

\(r=4\sqrt{3}\={6.9282....}\).

The maximum width for the crust possible = R - r = 8 - 6.9282... = 1.0717.... inches. -----> 1,1 width would make the surface area covered with topping less than 75%

Answer: A

I know this might be picky, but shouldn't OA be A ?

The approximate maximum is 1.1 inches.
_________________

Re: Marty's Pizza Shop guarantees that their pizzas all have a [#permalink]

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31 May 2015, 11:01

Bunuel wrote:

TehMoUsE wrote:

Bunuel wrote:

The approximate maximum is 1.1 inches.

I understand that, but the question doesn't say anything about approximations.

Is it silently implied in GMAT that you round up to the closest number, even tho it would give you the "wrong" answer?

Word "approximate" is missing there. It should be "what is the approximate maximum width you can expect to see for the crust?"

I think the keyword here is "at least" so, if 75% calculation comes to 1.08 we have no choice but to round up and select the closest, which in this case is 1.10 and not 1.06, which will breach the requirement of "at least 75%".. Lemme know your views. Thanks.

gmatclubot

Re: Marty's Pizza Shop guarantees that their pizzas all have a
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31 May 2015, 11:01

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