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Source: — Data Sufficiency |
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by jayhawk2001 » Tue Jun 26, 2007 9:13 pm
1- sufficient.
Exterior angle PRS = sum of interior opposite angles
= angle RPQ + angle PQR
= PRS - PQR = RPQ.
We know the difference and hence is sufficient.

2 - sufficient.
PQR + PRQ = 150
We know PRQ = 180 - angle-PRS
PQR + 180 - PRS = 150
We can hence find PRS - PQR

Hence D
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by moneyman » Sun Jul 01, 2007 9:43 am
Excellent approach Jayhawk..
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