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705-805 Level|   Non-Math Related|         
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shaliny
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GMAT Club Olympics 2025 (Day 4): African grey parrots cannot detect 04 Jul 2025, 23:14
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hii Bunuel,
how can we identify these type of questions because it looked simple but it was tricky and wanted careful analysis, Is there any specific way or language( in questions) need to focus to identify these type of questions?
Bunuel
­

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.
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D3N0
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GMAT Club Olympics 2025 (Day 4): African grey parrots cannot detect 04 Jul 2025, 23:45
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Ohh man .. I had that doubt about C and I even mentioned this in my explaination that E might be the answer.
But I chose C .. thinking "what if there is a trick, and question wants me think that way" I should have trusted my thought process. Need more confidence. :(
Bunuel
­

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.
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