Quote:
(B) A layer of primer on an airliner weighs more than a layer of the new coating would by an amount large enough to make a difference to that airliner's load-bearing capacity.
adkikani wrote:
gmat1393 GMATNinjaTwo nightblade354 generis VeritasKarishma W.r.t. solutions provided by
sayantanc2k and
AtlanticGMAT in the option B, we are only given that
the layer of primer will cause DIFFERENCE in load bearing capacity of airline. How it is safe to assume that
the bearing capacity will ONLY be INCREASED and not DECREASED as suggested by above members?
adkikani , interesting catch, but you have taken "difference" out of context.
It's not just a safe choice to assume that the load bearing capacity
must be increased. Increase in load-bearing capacity is the
only choice.
It's not the layer of Old Primer that "makes the difference."
The
switch from heavier Old Primer to the lighter New Coating makes the difference. And "switch to lighter" can ONLY be an increase in capacity to carry weight of the plane with the lighter layer.
The plane with lighter New Coating Layer carries
less layer weight. Now it can carry
more OTHER weight.
Let's say that I can carry 100 pounds. My backpack weighs 30 pounds. So I can put 70 pounds in my backpack.
Some wise person gives me a 10 pound backpack made of lighter but strong material. Now I can put 90 pounds in my backpack.
I just increased my load-bearing capacity by 20 pounds. I can put 20 more pounds of "stuff" in my backpack.
Similarly, if a paint layer weighs less, a plane's capacity to carry weight
other than the paint layer can ONLY increase.
The plane can now carry extra luggage, for example, at a charge.
Let Old Primer = 20 pounds. Plane #1 has Old Primer put on.
Let New Coating = 10 pounds. Plane #2 has New Coating put on.
Plane #2 with New Coating can carry 10 pounds more OTHER weight than Plane #1 with Old Primer --
every trip.
Say, too, that the airline charges $50 for 10 pounds' of luggage. Plane #2 can charge $50 for that 10 pounds of luggage that it can now carry because its New Coating Layer freed up 10 pounds.
Every time that the Plane #2 flies, it earns $50 more than Plane #1 earns for the same trip.
As soon as Plane #2 covers its New Coating costs, many times per day it earns $50 that Plane #1 does not earn. Now we have an economic benefit: spend more up front to earn a lot more over time.
If we decrease the weight of the layer, we increase the amount of other stuff the plane can carry. We increase the plane's load bearing capacity.
Now the question becomes: is the increase significant? Is the extra amount that the plane can carry enough to make an economic impact?
(B) says yes. The New Coating is lighter than the Old Primer
by an amount large enough to make a difference in plane's load-bearing capacity.The plane can carry other stuff, for which it can charge. Or, if the plane does not fill that extra capacity with stuff, the plane saves on fuel costs.
I am trying to figure out what you might be thinking. Space to carry? Foul. Importing facts not in evidence.
If I have not cleared up your doubt, see whether you can explain how the "difference" might be a decrease in load-bearing capacity of the plane with the lighter layer.
Hope that helps.
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