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03 Jul 2025, 08:00
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E
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Difficulty:
85%
(hard)
Question Stats:
23% (00:56) correct
77%
(00:50)
wrong
based on 587
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African grey parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers. Can an African grey parrot detect color W?
(1) Color V has a wavelength of 300 nanometers.
(2) The wavelength of color W is twice that of color V.
(1) Color V has a wavelength of 300 nanometers.
(2) The wavelength of color W is twice that of color V.
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03 Jul 2025, 08:30
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African grey parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers. Can an African grey parrot detect color W?
(1) Color V has a wavelength of 300 nanometers.
This is insufficient. We are told nothing about color W.
(2) The wavelength of color W is twice that of color V.
This is also insufficient. It only gives a relationship between W and V, without specifying either value.
(1)+(2) From the above, we can determine that the wavelength of color W is 600 nanometers. We know that parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers. However, we are not told what wavelengths below 620 are actually detectable. For example, if parrots can detect only colors in the range 610–619 nanometers, then a wavelength of 600 would still be undetectable. While it’s certainly possible that 600 is detectable, we cannot be sure. Not sufficient.
Answer: E.
GMAT Club Official Explanation:
African grey parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers. Can an African grey parrot detect color W?
(1) Color V has a wavelength of 300 nanometers.
This is insufficient. We are told nothing about color W.
(2) The wavelength of color W is twice that of color V.
This is also insufficient. It only gives a relationship between W and V, without specifying either value.
(1)+(2) From the above, we can determine that the wavelength of color W is 600 nanometers. We know that parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers. However, we are not told what wavelengths below 620 are actually detectable. For example, if parrots can detect only colors in the range 610–619 nanometers, then a wavelength of 600 would still be undetectable. While it’s certainly possible that 600 is detectable, we cannot be sure. Not sufficient.
Answer: E.
General Discussion
03 Jul 2025, 08:18
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African grey parrots cannot detect colors with wavelengths greater than or equal to 620 nanometers.
Can an African grey parrot detect color W?
Is wavelength of W<= 620?
Need W to answer this
S1
Color V has a wavelength of 300 nanometers.
No info on W
Insufficient
S2
The wavelength of color W is twice that of color V.
No info on V
Insufficient
Combined, we have wavelength of V=300, wavelength of W=600. Sufficient
Can an African grey parrot detect color W?
Is wavelength of W<= 620?
Need W to answer this
S1
Color V has a wavelength of 300 nanometers.
No info on W
Insufficient
S2
The wavelength of color W is twice that of color V.
No info on V
Insufficient
Combined, we have wavelength of V=300, wavelength of W=600. Sufficient
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