Taken from an IQ test.
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ANSWERS:
Helen is the tallest. (Let's say, 5'10"/178 cm)
Chris is the second tallest and either taller than Dave or close to the same height as Dave. (Let's say 5'7" to 5'8"/170-173 cm)
Dave is either shorter than Chris or the same height as Chris. (Let's say 5'6" to 5'7"/167-170 cm)
Jason is either the shortest or close to the same height as Dave. (Let's say 5'5" to 5'6"/165-167 cm)
Helen is the tallest. (Let's say, 5'10"/178 cm)
Chris is the second tallest and either taller than Dave or close to the same height as Dave. (Let's say 5'7" to 5'8"/170-173 cm)
Dave is either shorter than Chris or the same height as Chris. (Let's say 5'6" to 5'7"/167-170 cm)
Jason is either the shortest or close to the same height as Dave. (Let's say 5'5" to 5'6"/165-167 cm)
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