Question
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Seven boys P, Q, R, S, T, U and X have different weights. X is heavier than Q. P is heavier than only three people. Q is heavier than P. T is heavier than S but lighter than R. U is heavier than R but lighter than Q.
How many boys are lighter than U?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFFrom the given instructions:
1) X is heavier than Q. Q is heavier than P. P is heavier than only three people. So, we have two cases;
Case 1:
X/ > X/ > Q > P > __ > __ > __
Case 2:
X > Q > __ > P > __ > __ > __
2) T is heavier than S but lighter than R. U is heavier than R but lighter than Q. So, Case 1 is invalid.
So, Final Arrangement,
X > Q > U > P > R > T > S
Hence, four boys are lighter than U.
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